.github: actions: add docker-publish-release

This is based of [1] and will be used to publish tagged releases with a
different label to docker hub.

[1] https://docs.github.com/en/actions/publishing-packages/publishing-docker-images#publishing-images-to-docker-hub
Signed-off-by: Mattijs Korpershoek <[email protected]>

Author: Mattijs Korpershoek

.github/workflows/docker-publish-release.yml

@@ -0,0 +1,33 @@
+name: Publish Docker image release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: mkorpershoek/repo-resource
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}