Adding dockerimage.yml for GH Actions CI

.github/workflows/dockerimage.yml

@@ -0,0 +1,17 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+
+  build:
+ 
+    runs-on: ubuntu-latest
+ 
+    steps:
+    - uses: actions/checkout@v1
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag backup-server:$(date +%s)