Sync files with networkservicemesh/cmd-template

This PR syncs files with https://github.com/networkservicemesh/cmd-template

Revision: https://github.com/networkservicemesh/cmd-template/commits/60159f3a0d80d54f9a68ec4e2fa9f0afd5b0ff01

commit 60159f3a0d80d54f9a68ec4e2fa9f0afd5b0ff01
Author: Denis Tingaikin <49399980+denis-tingaikin@users.noreply.github.com>
Date:   Thu Jun 17 20:44:32 2021 +0700

    feat: Add release docker-push-ghcr workflow (#78)

    * Add release docker-push-ghcr

    Signed-off-by: denis-tingajkin <denis.tingajkin@xored.com>

    * apply review comments

    Signed-off-by: denis-tingajkin <denis.tingajkin@xored.com>

Signed-off-by: NSMBot <nsmbot@networkservicmesh.io>

.github/workflows/ci.yaml

@@ -3,7 +3,8 @@ name: ci
 on:
   push:
     branches:
-      - main
+      - 'main'
+      - 'release/**'
   pull_request:
 jobs:
   yamllint:

.github/workflows/release.yml

@@ -0,0 +1,40 @@
+---
+name: Release
+
+on:
+  workflow_run:
+    types:
+      - completed
+    workflows:
+      - 'ci'
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.workflow_run.conclusion == 'success' && contains(github.event.workflow_run.head_branch, 'release/') }}
+    steps:
+      - name: Get tag
+        run: |
+          branch=${{github.event.workflow_run.head_branch}}
+          echo '::set-output name=tag::'${branch#release/}
+        id: get-tag-step
+
+      - name: "Checkout"
+        uses: actions/checkout@v2
+
+      - name: "Set up Docker Buildx"
+        uses: docker/setup-buildx-action@v1
+
+      - name: "Login to GitHub Container Registry"
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: "Build and push"
+        uses: docker/build-push-action@v2
+        with:
+          file: Dockerfile
+          context: .
+          push: true
+          tags: "ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}:${{ steps.get-tag-step.outputs.tag }}"