actions: create build-only workflow for testing automated builds and later for PR autochecks

.gitea/workflows/build-only.yaml

@@ -0,0 +1,37 @@
+name: Build only (for PRs)
+
+on:
+  push:
+    branches:
+      - v1-refactor # after this has been merged 
+
+jobs:
+  build-only:
+    runs-on: ubuntu-latest  # Use a runner with Docker support
+    container: ghcr.io/catthehacker/ubuntu:act-latest  # Image with Docker pre-installed
+    outputs:
+      sha_short: ${{ steps.vars.outputs.sha_short }}
+    steps:
+      # Checkout the repository code
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set outputs
+        id: vars
+        run: |
+          echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+      # Set up Docker Buildx for building the image
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver: remote
+          endpoint: 'tcp://buildkitd:1234'
+
+      # Build and push the Docker image
+      - name: Build and Push Docker Image
+        uses: docker/build-push-action@v6
+        with:
+          context: .                    # Build context (current directory)
+          file: ./Dockerfile            # Path to Dockerfile
+          platforms: "linux/amd64,linux/arm64"