Publish to ghcr.io instead.

.github/workflows/ci.yaml

@@ -8,17 +8,27 @@ on:
 jobs:
   docker:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Login to DockerHub
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Lo in to the Container Registry
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build and push
-        id: docker_build
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+      - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
+          context: .
           push: true
-          tags: theelves/up:latest
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}