chore: Use dedicated runner for building ARM image to speed up the pr…

…ocess

.github/workflows/publish_image.yaml

@@ -6,12 +6,13 @@ on:
 env:
   REGISTRY: ghcr.io
 jobs:
-  Publish:
-    name: Publish example-restapi image
-    runs-on: ubuntu-22.04
-    permissions:
-      contents: read
-      packages: write
+  publish:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-24.04, ubuntu-24.04-arm]
+
     steps:
       - uses: actions/checkout@v4
       - name: Log in to the Container registry
@@ -20,14 +21,10 @@ jobs:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
       - name: Build and push Docker image
         uses: docker/build-push-action@v6
         with:
-          platforms: linux/amd64,linux/arm64
           push: true
-          provenance: false
           tags: ghcr.io/nordic-institute/xrddev-example-restapi:latest
       - name: Clean old images
         uses: snok/container-retention-policy@v2