Ship the intermediate CA in unkin-ca-certificates (#177)

`s3.ceph.unkin.net` serves a bare leaf issued by `CN=unkin.net Intermediate Authority`. The package shipped only the root, so images carrying just `unkin-ca-certificates` (container-base, container-gobuilder) cannot verify it — `curl https://s3.ceph.unkin.net/` returns 000.

- Fetch `pki_int` alongside `pki_root` and anchor it as `UNKIN_INTCA_2024.crt`
- Fail the build when a fetch errors or returns a non-certificate
- Bump version to `2026.10.2` on all distro targets

Verified in `gobuilder:0.1.1-alma9`: 000 before, 200 after, no `-k`.

Reviewed-on: #177
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

rpms/unkin-ca-certificates/metadata.yaml

@@ -12,16 +12,16 @@ builds:
   release: '1'
   repository:
   - almalinux/el8
-  version: 2025.07.13
+  version: 2026.10.2
 - image: git.unkin.net/unkin/almalinux9-rpmbuilder:latest
   release: '1'
   repository:
   - almalinux/el9
-  version: 2025.07.13
+  version: 2026.10.2
 - image: git.unkin.net/unkin/almalinux9-rpmbuilder:latest
   release: '1'
   repository:
   - fedora/42
   - fedora/43
   - fedora/44
-  version: 2025.07.13
+  version: 2026.10.2

rpms/unkin-ca-certificates/resources/build.sh

@@ -1,9 +1,15 @@
 #!/usr/bin/bash
 
-set -e
+set -euo pipefail
 
-# Download the CA certificate from vault
-curl -L -o /app/UNKIN_ROOTCA_2024.crt https://vault.query.consul:8200/v1/pki_root/ca/pem
+# Download the CA chain from vault; openssl verifies we got a certificate, not an error page
+fetch_ca() {
+  curl -fsSL -o "$2" "https://vault.query.consul:8200/v1/$1/ca/pem"
+  openssl x509 -in "$2" -noout -subject
+}
+
+fetch_ca pki_root /app/UNKIN_ROOTCA_2024.crt
+fetch_ca pki_int /app/UNKIN_INTCA_2024.crt
 
 # Process the nfpm.yaml template with environment variables
 envsubst < /app/resources/nfpm.yaml > /app/nfpm.yaml

rpms/unkin-ca-certificates/resources/nfpm.yaml

@@ -29,6 +29,12 @@ contents:
       mode: 0755
       owner: root
       group: root
+  - src: /app/UNKIN_INTCA_2024.crt
+    dst: /etc/pki/ca-trust/source/anchors/UNKIN_INTCA_2024.crt
+    file_info:
+      mode: 0755
+      owner: root
+      group: root
 
 # Scripts to run during installation/removal (optional)
 scripts: