Add ci workflow for building standalone docker image

.github/workflows/build-standalone-docker-image.yml

@@ -0,0 +1,30 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Log in to Docker Hub
+      run: echo '${{ secrets.DOCKER_HUB_PASS }}' | docker login -u djangohelpdesk --password-stdin
+
+    - name: Build Docker image
+      run: cd standalone ; docker build -t djangohelpdesk/standalone:latest ..
+
+    - name: Push Docker image
+      run: docker push djangohelpdesk/standalone:latest
+
+    - name: Tag and push Docker image with year, month and Git SHA
+      run: docker tag djangohelpdesk/standalone:latest djangohelpdesk/standalone:$(date +%Y-%m)-$(git rev-parse --short HEAD) ; docker push djangohelpdesk/standalone:$(date +%Y-%m)-$(git rev-parse --short HEAD)
+
+    - name: If we are at a tag, add a tag to the current docker image push the image with the tag
+      if: startsWith(github.ref, 'refs/tags/')
+      run: docker tag djangohelpdesk/standalone:latest djangohelpdesk/standalone:${{ github.ref }} ; docker push djangohelpdesk/standalone:${{ github.ref }}

docs/standalone.rst

@@ -1,7 +1,9 @@
 Django-Helpdesk Standalone Installation
 =======================================
 
-Installation
+You can find standalone docker images at `djangohelpdesk/standalone:latest <https://hub.docker.com/r/djangohelpdesk/standalone/tags>`_.
+
+Installation using docker-compose
 ------------
 
 1. Clone the django-helpdesk repository: