feat: added mozcloud-publish workflow to build and push container images to GAR and GHCR (#18)

Author: dlactin

.github/workflows/build-and-push-images.yaml

@@ -0,0 +1,54 @@
+name: Go Demo -- Build, Tag and Push Container Images to Repository
+
+on:
+  pull_request:
+    types: [labeled, unlabeled, synchronize]
+  push:
+    branches:
+      - main
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+  workflow_dispatch: {}
+
+jobs:
+  build-and-push:
+    if: >
+      github.event_name == 'push' ||
+      github.event_name == 'workflow_dispatch' ||
+      (
+        github.event_name == 'pull_request' &&
+        contains(github.event.pull_request.labels.*.name, 'preview') &&
+        github.event.pull_request.head.repo.full_name == github.repository
+      )
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write # Only required if you're publishing to GHCR
+      id-token: write
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      with:
+        fetch-tags: true
+        ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref }}
+    - name: Run the release script to build version.json file
+      id: release
+      working-directory: ./go-demo
+      run: ./release.sh
+    - name: Build and Tag Container Image
+      id: build
+      uses: mozilla/deploy-actions/docker-build@f6e53875d3aff6c2dc4d3499643004376abe0a8a # v3.18.4
+      with:
+        image_name: go-demo
+        gar_name: cicd-demos-nonprod
+        project_id: moz-fx-cicd-demos-nonprod
+        should_tag_ghcr: true
+        image_build_context: "./go-demo/"
+
+    - name: Push Container Image to GAR and GHCR Repositories
+      id: push
+      uses: mozilla-it/deploy-actions/docker-push@f6e53875d3aff6c2dc4d3499643004376abe0a8a # v3.18.4
+      with:
+        image_tags: ${{ steps.build.outputs.image_tags }}
+        should_authenticate_to_ghcr: true
+        project_id: moz-fx-cicd-demos-nonprod
+        workload_identity_pool_project_number: ${{ vars.GCPV2_WORKLOAD_IDENTITY_POOL_PROJECT_NUMBER }}