feat: Add CD using GitHub Actions

.github/workflows/publish.yaml

@@ -0,0 +1,45 @@
+name: Publish
+
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  publish:
+    runs-on:
+      #- self-hosted
+      - ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Set up Go 1.14
+        uses: actions/setup-go@v1
+        with:
+           go-version: 1.14.7
+        id: go
+      - uses: actions/checkout@v2
+        with:
+         path: src/github.com/kubeflow/tf-operator
+      - name: setup env
+        run: |
+          cd src/github.com/kubeflow/tf-operator
+          pwd
+          go env
+          echo "GOPATH=$(go env GOPATH):$GITHUB_WORKSPACE" >> $GITHUB_ENV
+          echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+          echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
+      - name: before_install
+        run: |
+          # get coveralls.io support
+          go get github.com/kubeflow/tf-operator
+      - name: docker-build
+        run: |
+          cd src/github.com/kubeflow/tf-operator
+          docker build -t ghcr.io/kubeflow/tf-operator:$RELEASE_VERSION -f build/images/tf_operator/Dockerfile .
+      - name: Login to GitHub Container Registry
+        run: echo "${{ secrets.GHCR_TOKEN }}" | docker login ghcr.io -u ${{ secrets.GHCR_USERNAME }} --password-stdin
+      - name: docker-push
+        run: |
+          docker push ghcr.io/kubeflow/tf-operator:$RELEASE_VERSION -f build/images/tf_operator/Dockerfile .