[mod] rework container deployment (#4764)

container.yml will run after integration.yml COMPLETES successfully and in master branch.

Style changes, cleanup and improved integration with CI by leveraging the use of
shared cache between all workflows.

* Podman is now supported to build the container images (Docker also received a refactor, merging both build and buildx)
* Container images are being built by Buildah instead of Docker BuildKit.
* Container images are tested before release.
* Splitting "modern" (amd64 & arm64) and "legacy" (armv7) arches on different Dockerfiles allowing future optimizations.

.github/workflows/integration.yml

@@ -94,49 +94,3 @@ jobs:
 
       - name: Build
         run: make themes.all
-
-  dockers:
-    name: Docker
-    if: github.ref == 'refs/heads/master'
-    needs:
-      - test
-      - theme
-    env:
-      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
-    runs-on: ubuntu-24.04
-    steps:
-      - name: Checkout
-        if: env.DOCKERHUB_USERNAME != null
-        uses: actions/checkout@v4
-        with:
-          # make sure "make docker.push" can get the git history
-          fetch-depth: '0'
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-          architecture: 'x64'
-      - name: Cache Python dependencies
-        id: cache-python
-        uses: actions/cache@v4
-        with:
-          path: |
-            ./local
-            ./.nvm
-            ./node_modules
-          key: python-ubuntu-20.04-3.12-${{ hashFiles('requirements*.txt', 'setup.py','.nvmrc', 'package.json') }}
-      - name: Set up QEMU
-        if: env.DOCKERHUB_USERNAME != null
-        uses: docker/setup-qemu-action@v1
-      - name: Set up Docker Buildx
-        if: env.DOCKERHUB_USERNAME != null
-        uses: docker/setup-buildx-action@v1
-      - name: Login to DockerHub
-        if: env.DOCKERHUB_USERNAME != null
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build and push
-        if: env.DOCKERHUB_USERNAME != null
-        run: make -e GIT_URL=$(git remote get-url origin) docker.buildx