CI: Build docker on PR and push when tags are created

.github/workflows/docker-publish.yml

@@ -0,0 +1,39 @@
+name: Docker
+
+on:
+  push:
+    tags:
+      - "mr*"
+  pull_request:
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v6
+        with:
+          images: |
+            sipwise/rtpengine
+          tags: |
+            type=match,pattern=mr(.*),group=1
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v4
+        if: ${{ github.event_name != 'pull_request' }}
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v7
+        with:
+          platforms: ${{ github.event_name != 'pull_request' && 'linux/amd64,linux/arm64' || 'linux/amd64' }}
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}