workflow: add workflow to push images to Docker Hub

.github/workflows/publish_to_dockerhub.yml

@@ -0,0 +1,82 @@
+name: Push images to DockerHub
+
+# Controls when the action will run.
+on:
+  push:
+    # Publish `master` as Docker `latest` and `git_revision` images.
+    branches:
+      - master
+  release:
+    # Publish released commit as Docker `latest` and `git_revision` images.
+    types:
+      - published
+
+  # Allows to run this workflow manually from the Actions tab.
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'Ref to build Docker image [default: latest master; examples: v0.92.0, 0a4ff9d3e4a9ab432fd5812eb18c98e03b5a7432]'
+        required: false
+        default: ''
+      push_image:
+        description: 'Push image to DockerHub [default: false; examples: true, false]'
+        required: false
+        default: 'false'
+
+# A workflow run.
+jobs:
+  publish:
+    name: Publish image to DockerHub
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout (manual run)
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.inputs.ref }}
+          # Allows to fetch all history for all branches and tags. Need this for proper versioning.
+          fetch-depth: 0
+
+      - name: Checkout (automatical run)
+        if: ${{ github.event_name != 'workflow_dispatch' }}
+        uses: actions/checkout@v2
+        with:
+          # Allows to fetch all history for all branches and tags. Need this for proper versioning.
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+
+      - name: Restore go modules from cache
+        uses: actions/cache@v2
+        with:
+          path: /home/runner/go/pkg/mod
+          key: deps-${{ hashFiles('go.sum') }}
+
+      - name: Update Go modules
+        run: go mod download -json
+
+      - name: Build image
+        run: make image
+
+      - name: Build image with 'latest' tag
+        if: ${{ github.event_name == 'release' && github.event.release.target_commitish == 'master' }}
+        run: make image
+        env:
+          HUB_TAG:latest
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Push image to registry
+        if: ${{ github.event_name == 'release' || (github.event_name == 'workflow_dispatch' && github.event.inputs.push_image == 'true') }}
+        run: make image-push
+
+      - name: Push image with 'latest' tag to registry
+        if: ${{ github.event_name == 'release' && github.event.release.target_commitish == 'master' }}
+        run: make image-push-latest