Update docker build workflow

.github/workflows/52n-build-4.2.x.yml

@@ -0,0 +1,59 @@
+name: "[52n-4.2.x -> 4.2.x] Builds GeoNode Docker Images"
+
+concurrency:
+  group: "geonode_build_master"
+  cancel-in-progress: true
+
+env:
+  TITLE: "52°North GeoNode Docker Image"
+  VENDOR: "52°North GmbH"
+  AUTHORS: "https://52North.org/"
+  DESCRIPTION: "Builds and publishes the Docker images GeoNode, GeoServer, Nginx"
+  LICENSE: "GPL-3.0"
+  TAG: 4.2.x
+
+on:
+  push:
+    branches:
+      - "52n-4.2.x"
+
+jobs:
+  build_and_push_geonode:
+    runs-on: ubuntu-22.04
+    env:
+      IMAGE: 52north/geonode
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.IMAGE }}
+          labels: |
+            "org.opencontainers.image.authors=${{ env.AUTHORS }}"
+            "org.opencontainers.image.vendor=${{ env.VENDOR }}"
+            "org.opencontainers.image.description=${{ env.DESCRIPTION }}"
+            "org.opencontainers.image.title=${{ env.TITLE }}"
+            "org.opencontainers.image.licenses=${{ env.LICENSE }}"
+          tags: |
+            latest
+            ${{ env.TAG }}
+            
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_52N_MASTER }}
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=${{ env.IMAGE }}:buildcache
+          cache-to: type=registry,ref=${{ env.IMAGE }}:buildcache,mode=max