refactor: modernise RPM builder with Python tooling

- Replace Makefile version/release file system with metadata.yaml only
- Add Python build automation (./tools/build) with Gitea API integration
- Add GitHub release updater (./tools/update-gh) for version management
- Centralize Dockerfiles into single parameterized Dockerfile
- Remove 54+ individual package Dockerfiles and version directories
- Update Makefile to use new Python tooling
- Add GITEA_API_TOKEN validation to prevent duplicate builds
- Support both explicit version/release args and metadata.yaml reading

.gitea/workflows/build.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: almalinux-8
     container:
       image: git.unkin.net/unkin/almalinux8-actionsdind:latest
-      options: --privileged
+      options: "--privileged --volume /etc/pki/tls/vault:/etc/pki/tls/vault:ro"
 
     steps:
       - name: Checkout code
@@ -36,7 +36,7 @@ jobs:
     runs-on: almalinux-8
     container:
       image: git.unkin.net/unkin/almalinux9-actionsdind:latest
-      options: --privileged
+      options: "--privileged --volume /etc/pki/tls/vault:/etc/pki/tls/vault:ro"
 
     steps:
       - name: Checkout code