Added automated docker image build and push upon tagged version

Author: Michael Schroder

.github/workflows/docker.yml

@@ -0,0 +1,48 @@
+name: "ci/gh-actions/docker-image"
+
+on:
+  push:
+    tags: [ 'release-v*.*' ]
+
+jobs:
+  docker_buildx_debian:
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - name: configure git
+        run: git config --global --add safe.directory '*'
+
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # Needed for tags
+          submodules: recursive
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract Version
+        run: |
+          export MONERO_VERSION="$(git describe --tags)"
+          echo "MONERO_VERSION=$MONERO_VERSION" >> $GITHUB_ENV
+
+      - name: Build and push latest Debian image
+        uses: docker/[email protected]
+        with:
+          context: ./
+          file: ./Dockerfile
+          platforms: |
+            linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: |
+            ${{ vars.DOCKERHUB_USERNAME }}/monero:latest
+            ${{ vars.DOCKERHUB_USERNAME }}/monero:${{ env.MONERO_VERSION }}
+