CI: Add workflow to publish Docker images

.github/workflows/docker.yml

@@ -0,0 +1,32 @@
+name: Publish Docker image
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  publish_image:
+    name: Publish Docker image
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: isciences/exactextract
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Build and Push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.id.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}