CI: Add release pipeline

Closes #17

.github/workflows/release.yaml

@@ -0,0 +1,105 @@
+name: Build & release Docker images
+
+on:
+  push:
+    branches:
+      - "**"
+    tags:
+      - 'v*'
+    paths:
+      - 'cmd/seaweedfs-csi-driver/Dockerfile'
+      - 'cmd/seaweedfs-csi-driver/*.go'
+      - 'pkg/driver/**'
+      - 'go.*'
+      - '.github/**'
+
+  # Build on PR
+  pull_request:
+
+  # Allow trigger for external PRs
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Fetch history
+        run: git fetch --prune --unshallow
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Get the current tag name
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to DockerHub
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: docker/login-action@v1 
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GHCR_TOKEN }}
+
+      - name: Annotate Docker images
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        id: docker_meta
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: ${{ github.repository }}
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./cmd/seaweedfs-csi-driver/Dockerfile
+          platforms: linux/amd64
+          push: false
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          tags: ${{ github.repository }}:${{ env.RELEASE_VERSION }}
+
+      - name: Publish Docker image to DockerHub & GitHub Container Registry
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./cmd/seaweedfs-csi-driver/Dockerfile
+          platforms: linux/amd64
+          push: ${{ startsWith(github.ref, 'refs/tags/') }}
+          labels: ${{ steps.docker_meta.outputs.labels }}
+          tags: |
+            ${{ github.repository }}:${{ env.RELEASE_VERSION }}
+            ghcr.io/${{ github.repository }}:${{ env.RELEASE_VERSION }}
+
+      - name: Update DockerHub repo description
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: peter-evans/dockerhub-description@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          repository: ${{ github.repository }}
+
+      - name: Create Release
+        if: ${{ startsWith(github.ref, 'refs/tags/') }}
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ env.RELEASE_VERSION }}