Added github action to publish docker image

.github/workflows/docker-publish.yml

@@ -0,0 +1,51 @@
+name: Docker
+
+on:
+  push:
+    branches:
+      - master
+      - Dockerfile-use-installer
+  pull_request:
+    branches:
+      - master
+      - Dockerfile-use-installer
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: fomu-toolchain
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build ./dockerfiles --file dockerfiles/Dockerfile.use-installer --tag $IMAGE_NAME
+
+      - name: Log into registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
+  
+      - name: Push image
+        run: |
+          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/$IMAGE_NAME
+  
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+  
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+  
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+  
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "master" ] && VERSION=latest
+  
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+  
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION