Update maven.yml

Author: nijogeorgep

.github/workflows/maven.yml

@@ -22,3 +22,5 @@ jobs:
  java-version: 1.11
  - name: Build with Maven
  run: mvn -B package --file pom.xml
+ - name: Build the Docker image
+ run: docker build . --file Dockerfile --tag my-image-name:$(date +%s)