feature : add docker-publish.yaml

instead of building the docker image everytime used, save the docker image to the DockerHub

Author: beachdweller

.github/workflows/docker-publish.yml

@@ -0,0 +1,63 @@
+name: Docker Publish
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Prepare
+        id: prep
+        run: |
+          DOCKERHUB_IMAGE=kangwonlee/gemini-python-tutor
+          GHCR_IMAGE=ghcr.io/${{ github.repository_owner }}/gemini-python-tutor
+          VERSION=${GITHUB_REF#refs/tags/v}
+          MINOR=${VERSION%.*}
+          MAJOR=${VERSION%%.*}
+          TAGS="${DOCKERHUB_IMAGE}:${MAJOR},${DOCKERHUB_IMAGE}:${MINOR}"
+          TAGS="${TAGS},${DOCKERHUB_IMAGE}:${VERSION},${DOCKERHUB_IMAGE}:latest"
+          TAGS="${TAGS},${GHCR_IMAGE}:${MAJOR},${GHCR_IMAGE}:${MINOR}"
+          TAGS="${TAGS},${GHCR_IMAGE}:${VERSION},${GHCR_IMAGE}:latest"
+          echo "tags=${TAGS}" >> $GITHUB_OUTPUT
+          echo "version=${VERSION}" >> $GITHUB_OUTPUT
+          echo "dockerhub_image=${DOCKERHUB_IMAGE}" >> $GITHUB_OUTPUT
+          echo "ghcr_image=${GHCR_IMAGE}" >> $GITHUB_OUTPUT
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3 
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Login to Github Container Registry
+        uses: docker/login-action@v3 
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/386,linux/arm/v7,linux/arm/v6
+          push: true
+          tags: ${{ steps.prep.outputs.tags }}
+          labels: org.opencontainers.image.version=${{ steps.prep.outputs.version }}