Publish vendor RPMs to artifactapi rpm-vendor, one package per job

Builds currently push to Gitea's RPM registry and run build-all in a single
job. Publish instead to the artifactapi rpm-vendor local repos (real yum
repos; repodata regenerates automatically) and give each vendor package its
own job so failures are isolated and builds parallelise. Because builds no
longer land in Gitea, the "skip already-built version" check now probes
artifactapi.

- tools/build: repoint check_package_exists from the Gitea packages API to
  the artifactapi rpm-vendor repo (GET the served Packages/<file>.rpm path).
  Add get_vendor_repo() (distro -> rpm-vendor-<suffix>) and get_rpm_arch()
  (amd64 -> x86_64), and carry arch on PackageInfo so the probed filename
  matches the built RPM.
- .woodpecker: replace the per-distro build-all pipelines with per-distro
  matrix pipelines over PACKAGE, so each package builds in its own job.
  deploy-*.yaml (master push) build each package and PUT its RPM to the
  distro's rpm-vendor repo; build-*.yaml (pull_request) build as a check.
- tools/gen-pipelines + `make pipelines`: generate the .woodpecker matrix
  pipelines from rpms/*/metadata.yaml (source of truth for target distros);
  regenerate after adding or removing packages.

tools/build

@@ -63,6 +63,7 @@ def _make_session(retries: int = 3, backoff_factor: float = 0.5) -> requests.Ses
 # requests.Session is thread-safe for concurrent requests.
 _gitea_session = _make_session()
 _github_session = _make_session()
+_artifactapi_session = _make_session()
 
 
 # ==================== VALIDATION SCHEMA ====================
@@ -567,68 +568,77 @@ def effective_release(base_release: str, distro: str, use_dist_tag: bool) -> str
     return f"{base_release}.{tag}" if tag else base_release
 
 
-def check_package_exists(package_name: str, version: str, release: str) -> bool:
+def get_vendor_repo(distro: str) -> str:
     """
-    Check if a package version exists in the Gitea package registry.
+    Map a distro path to its artifactapi rpm-vendor local repo name.
 
-    Distro disambiguation is handled by the caller via the release string:
-    when dist_tag is enabled the caller appends the dist tag to release
-    (e.g. '1.el9', '1.fc43') so each distro maps to a unique version entry.
+    Examples:
+        'almalinux/el8' -> 'rpm-vendor-el8'
+        'almalinux/el9' -> 'rpm-vendor-el9'
+        'fedora/42'     -> 'rpm-vendor-f42'
+    """
+    if distro.startswith('almalinux/'):
+        return 'rpm-vendor-' + distro.split('/', 1)[1]
+    if distro.startswith('fedora/'):
+        return 'rpm-vendor-f' + distro.split('/', 1)[1]
+    return 'rpm-vendor'
+
+
+def get_rpm_arch(arch: str) -> str:
+    """Map a metadata arch to the RPM architecture used in built filenames."""
+    return {'amd64': 'x86_64', 'arm64': 'aarch64'}.get(arch, arch)
+
+
+def check_package_exists(
+    package_name: str,
+    version: str,
+    release: str,
+    distro: str,
+    arch: str = 'amd64',
+) -> bool:
+    """
+    Check if a built RPM already exists in the artifactapi rpm-vendor repo.
+
+    Each distro publishes to its own local repo (rpm-vendor-el9, rpm-vendor-f42,
+    ...), and dist_tag disambiguation is carried in the release string (e.g.
+    '1.el9', '1.fc43'), so the served RPM filename is unique per distro. We probe
+    the served path under Packages/ with a GET (artifactapi has no HEAD route).
 
     Args:
         package_name: Name of the package
         version: Version string
-        release: Effective release (may include dist tag suffix)
+        release: Effective release (may include dist tag suffix, e.g. '1.el9')
+        distro: Target distro (e.g. 'almalinux/el9', 'fedora/42')
+        arch: Package arch from metadata (default 'amd64')
 
     Returns:
-        True if package exists, False otherwise
+        True if the RPM is already published, False otherwise
     """
     logger = logging.getLogger(__name__)
 
-    # Get configuration from environment
-    base_url = os.getenv('GITEA_URL', 'https://git.unkin.net')
-    owner = os.getenv('GITEA_OWNER', 'unkin')
-    package_type = os.getenv('GITEA_PACKAGE_TYPE', 'rpm')
-
-    # Get Gitea token from Vault - fail hard if unavailable
-    gitea_token = get_gitea_token()
+    base_url = os.getenv('ARTIFACTAPI_URL', 'https://artifactapi.k8s.syd1.au.unkin.net')
+    repo = get_vendor_repo(distro)
+    rpm_file = f"{package_name}-{version}-{release}.{get_rpm_arch(arch)}.rpm"
+    url = f"{base_url}/api/v2/remotes/{repo}/files/Packages/{rpm_file}"
 
     try:
-        # Normalize version by removing leading zeros (Gitea does this automatically)
-        # e.g., "2025.08.03" becomes "2025.8.3"
-        normalized_version = normalize_version(version)
-        full_version = f"{normalized_version}-{release}"
-        url = (
-            f"{base_url}/api/v1/packages/{owner}/"
-            f"{package_type}/{package_name}/{full_version}"
-        )
-
-        _gitea_session.headers.update({'Authorization': f'token {gitea_token}'})
-
         logger.debug(f"Checking package existence: {url}")
-        response = _gitea_session.get(url, timeout=10)
+        response = _artifactapi_session.get(url, timeout=10)
 
         if response.status_code == 200:
-            package_info = response.json()
-            exists = bool(package_info.get('id'))
-            logger.debug(f"Package {package_name}:{full_version} {'exists' if exists else 'not found'}")
-            return exists
-
-        elif response.status_code == 404:
-            logger.debug(f"Package {package_name}:{full_version} not found (404)")
-            return False
-        elif response.status_code == 401:
-            logger.error("Authentication failed. Check GITEA_API_TOKEN.")
-            return False
-        else:
-            logger.warning(
-                f"Unexpected response checking package {package_name}:{full_version}: "
-                f"{response.status_code} - {response.text}"
-            )
+            logger.debug(f"Package {rpm_file} exists in {repo}")
+            return True
+        if response.status_code == 404:
+            logger.debug(f"Package {rpm_file} not found in {repo} (404)")
             return False
+        logger.warning(
+            f"Unexpected response checking {rpm_file} in {repo}: "
+            f"{response.status_code}"
+        )
+        return False
 
     except requests.RequestException as e:
-        logger.error(f"Failed to check package {package_name}:{version}-{release}: {e}")
+        logger.error(f"Failed to check {rpm_file} in {repo}: {e}")
         return False
 
 
@@ -1251,6 +1261,7 @@ class PackageInfo:
     directory: Path
     distro: str = 'almalinux/el9'
     base_image: str = "git.unkin.net/unkin/almalinux9-rpmbuilder:latest"
+    arch: str = 'amd64'
 
     def __str__(self):
         return f"{self.name}-{self.version}-{self.release} ({self.distro})"
@@ -1328,7 +1339,7 @@ class Builder:
                                 # Use the first repository as the distro identifier
                                 build_distro = repositories[0] if repositories else 'unknown'
                                 rel = effective_release(str(release), build_distro, use_dist_tag)
-                                packages.append(PackageInfo(package_name, version, rel, package_dir, build_distro, base_image))
+                                packages.append(PackageInfo(package_name, version, rel, package_dir, build_distro, base_image, arch=metadata.get('arch', 'amd64')))
                 else:
                     # Build for specific distro
                     for build_config in build_configs:
@@ -1341,7 +1352,7 @@ class Builder:
                             # Check if the target distro matches any repository
                             if distro in repositories and base_image and version and release:
                                 rel = effective_release(str(release), distro, use_dist_tag)
-                                packages.append(PackageInfo(package_name, version, rel, package_dir, distro, base_image))
+                                packages.append(PackageInfo(package_name, version, rel, package_dir, distro, base_image, arch=metadata.get('arch', 'amd64')))
                                 break
                     else:
                         # If no matching distro found, log a warning
@@ -1440,7 +1451,7 @@ class Builder:
             return False
 
         rel = effective_release(release, distro, use_dist_tag)
-        package_info = PackageInfo(package, version, rel, package_dir, distro, base_image)
+        package_info = PackageInfo(package, version, rel, package_dir, distro, base_image, arch=metadata.get('arch', 'amd64'))
         return self._build_package(package_info, dry_run, force, native, buildah)
 
     def build_all(self, dry_run: bool = False, force: bool = False, parallel: int = 4, distro: str = 'el/9', native: bool = False, buildah: bool = False) -> bool:
@@ -1522,7 +1533,9 @@ class Builder:
                 if check_package_exists(
                     package_info.name,
                     package_info.version,
-                    package_info.release
+                    package_info.release,
+                    package_info.distro,
+                    package_info.arch,
                 ):
                     self.logger.info(
                         f"Skipping {package_info} (already exists in repository)"