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

@@ -18,7 +18,7 @@ jobs:
 
       - name: Build Packages
         run: |
-          make all
+          make all DISTRO=el/8
 
       - name: Show RPMs
         run: |
@@ -42,7 +42,7 @@ jobs:
 
       - name: Build Packages
         run: |
-          make all
+          make all DISTRO=el/9
 
       - name: Show RPMs
         run: |