remote_rpm: stop caching repodata as immutable

repodata (repomd.xml and its referenced index files) is a mutable index that
upstream RPM repos rotate frequently. Marking it immutable (immutable_ttl: 0)
makes artifactapi cache repomd.xml forever: classifier.go checks
immutable_patterns before the RPM provider's own rule (which already classifies
repodata/ as mutable), and SetTTL with ttl=0 writes a Redis key with no expiry.
The result is a stale repomd.xml that keeps pointing at checksum-named metadata
files upstream has already deleted -> 404 on dnf metadata refresh. This broke
rpmbuilder's almalinux8 builds via the epel remote and would eventually hit any
rolling RPM remote.

Remove the repodata immutable patterns from every remote_rpm config so repodata
falls through to the provider's Mutable classification and is re-fetched every
mutable_ttl. RPMs, noarch, GPG keys and .img files stay immutable.

- Drop ".*/repodata/.*\.{xml,sqlite,yaml}.*$" from all config/remote_rpm/*.yaml
  (14 files, 20 lines).

After apply, the already-cached stale repodata entries must be evicted (they
have no expiry); that is done per-remote as a follow-up.

config/remote_rpm/almalinux-vault.yaml

@@ -5,9 +5,6 @@ mutable_ttl: 7200
 immutable_patterns:
   - ".*/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.sqlite.*$"
-  - ".*/repodata/.*\\.xml.*$"
-  - ".*/repodata/.*\\.yaml.*$"
   - ".*/install.img"
   - ".*/squashfs.img"
   - ".*/updates.img"

config/remote_rpm/almalinux.yaml

@@ -5,9 +5,6 @@ mutable_ttl: 7200
 immutable_patterns:
   - ".*/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.sqlite.*$"
-  - ".*/repodata/.*\\.xml.*$"
-  - ".*/repodata/.*\\.yaml.*$"
   - ".*/install.img"
   - ".*/squashfs.img"
   - ".*/updates.img"

config/remote_rpm/ceph-reef.yaml

@@ -5,4 +5,3 @@ mutable_ttl: 7200
 immutable_patterns:
   - ".*/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"

config/remote_rpm/ceph-squid.yaml

@@ -5,4 +5,3 @@ mutable_ttl: 7200
 immutable_patterns:
   - ".*/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"

config/remote_rpm/ceph-tentacle.yaml

@@ -5,4 +5,3 @@ mutable_ttl: 7200
 immutable_patterns:
   - ".*/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"

config/remote_rpm/claude-code.yaml

@@ -3,4 +3,3 @@ description: "Claude Code RPM repository"
 immutable_patterns:
   - ".*/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"

config/remote_rpm/epel.yaml

@@ -5,7 +5,4 @@ mutable_ttl: 7200
 immutable_patterns:
   - ".*/Everything/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.sqlite.*$"
-  - ".*/repodata/.*\\.xml.*$"
-  - ".*/repodata/.*\\.yaml.*$"
   - "RPM-GPG-KEY-.*$"

config/remote_rpm/fedora.yaml

@@ -7,4 +7,3 @@ immutable_patterns:
   - "updates/.*/Everything/x86_64/.*\\.rpm$"
   - "development/.*/Everything/x86_64/.*\\.rpm$"
   - ".*/noarch/.*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"

config/remote_rpm/frr.yaml

@@ -4,4 +4,3 @@ immutable_ttl: 0
 mutable_ttl: 7200
 immutable_patterns:
   - ".*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"

config/remote_rpm/mariadb.yaml

@@ -4,5 +4,4 @@ immutable_ttl: 0
 mutable_ttl: 7200
 immutable_patterns:
   - ".*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"
   - ".*/RPM-GPG-KEY-.*$"

config/remote_rpm/openvox.yaml

@@ -4,5 +4,4 @@ immutable_ttl: 0
 mutable_ttl: 7200
 immutable_patterns:
   - ".*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"
   - "GPG-KEY-.*$"

config/remote_rpm/postgresql.yaml

@@ -4,6 +4,5 @@ immutable_ttl: 0
 mutable_ttl: 7200
 immutable_patterns:
   - ".*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"
   - ".*/RPM-GPG-KEY-.*$"
   - ".*/PGDG-RPM-GPG-KEY-.*$"

config/remote_rpm/rke2.yaml

@@ -4,5 +4,4 @@ immutable_ttl: 0
 mutable_ttl: 7200
 immutable_patterns:
   - ".*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"
   - "public.key$"

config/remote_rpm/zfs.yaml

@@ -4,4 +4,3 @@ immutable_ttl: 0
 mutable_ttl: 7200
 immutable_patterns:
   - ".*\\.rpm$"
-  - ".*/repodata/.*\\.xml.*$"