Create container build workflow

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Automatic Build
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "master" branch
+  push:
+    # branches: [ "master" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build and Publish Tag Docker image
+        uses: VaultVulp/gp-docker-action@1.1.12
+        with:
+            github-token: ${{ secrets.GITHUB_TOKEN }} # Provide GITHUB_TOKEN to login into the GitHub Packages
+            image-name: nextcloud # Provide only Docker image name
+            extract-git-tag: true # Provide flag to extract Docker image tag from git reference
+    
+#    # Steps represent a sequence of tasks that will be executed as part of the job
+#    steps:
+#      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+#      - uses: actions/checkout@v3
+#
+#      # Runs a single command using the runners shell
+#      - name: Run a one-line script
+#        run: echo Hello, world!
+#
+#      # Runs a set of commands using the runners shell
+#      - name: Run a multi-line script
+#        run: |
+#          echo Add other actions to build,
+#          echo test, and deploy your project.