added workflow to create Docker image

Signed-off-by: J Mozdzen <31672367+jmozd@users.noreply.github.com>

.github/workflows/docker-image.yml

@@ -0,0 +1,19 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "master" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build the Docker image
+      run: |
+        echo "${{ secrets.DOCKER_HUB_TOKEN }}" | docker login -u "${{ secrets.DOCKER_HUB_USERNAME }}" --password-stdin docker.io
+        docker build . --file Dockerfile --tag docker.io/${{ secrets.DOCKER_HUB_USERNAME }}/${{ secrets.DOCKER_HUB_REPOSITORY }}:latest
+        docker push docker.io/${{ secrets.DOCKER_HUB_USERNAME }}/${{ secrets.DOCKER_HUB_REPOSITORY }}:latest