CI: Modernize a bit (adding docker LABELs too)

.github/workflows/docker.yml

@@ -1,27 +1,50 @@
-# SPDX-FileCopyrightText: 2021 Robin Vobruba <[email protected]>
+# SPDX-FileCopyrightText: 2021-2024 Robin Vobruba <[email protected]>
 #
 # SPDX-License-Identifier: Unlicense
 
 name: Publish Docker image
+
 on:
   push:
     branches: [ master ]
   release:
     types: [published]
+
+env:
+  IMAGE_NAME: hoijui/movedo
+
 jobs:
   push_to_registry:
     name: Push Docker image to Docker Hub
     runs-on: ubuntu-latest
     steps:
-      - name: Check out the repo
-        uses: actions/checkout@v2
-      - name: Push to Docker Hub
-        uses: docker/build-push-action@v1
+      -
+        name: Checkout
+        uses: actions/checkout@v4
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
+          fetch-depth: 0
+          fetch-tags: true
+          submodules: true
+      -
+        name: Login to DockerHub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-          repository: hoijui/movedo
-          tag_with_ref: true
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_NAME }}
+      -
+        name: Push to Docker Hub
+        uses: docker/build-push-action@v6
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
       #- name: Push to GitHub Packages
       #  uses: docker/build-push-action@v2
       #  with: