replaced branch build by PR build only (#203)

.github/workflows/docker-build-pr.yml

@@ -0,0 +1,67 @@
+name: Build PR
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+      attestations: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Extract PR information
+        id: extract_pr
+        run: |
+          echo "PR_NUMBER=${{ github.event.number }}" >> $GITHUB_ENV
+          echo "REGISTRY_LOWER=$(echo '${{ env.REGISTRY }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+          echo "REPOSITORY_LOWER=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3.1.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      # Build Docker Images (amd64 and arm64)
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Create version files
+        run: |
+          echo "pr-${{ env.PR_NUMBER }}" > version.txt
+          echo "${{ github.sha }}" > version_githash.txt
+          ls -ltr
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v5.3.0
+        with:
+          context: .
+          platforms: linux/amd64,linux/aarch64
+          push: true
+          tags: |
+            ${{ env.REGISTRY_LOWER }}/${{ env.REPOSITORY_LOWER }}:pr-${{ env.PR_NUMBER }}
+          labels: |
+            pr=${{ env.PR_NUMBER }}
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1.4.4
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ github.repository }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true