Update ci.yml

.github/workflows/ci.yml

@@ -10,29 +10,29 @@ on:
     branches: [ master ]
 
 jobs:
-  build:
-
-    runs-on: ${{matrix.os}}
-    strategy: 
-      matrix: 
-       os: [ubuntu-latest, windows-latest, macOS-latest]
+  build-java:
 
+    runs-on: ubuntu-latest
+
     steps:
     - uses: actions/checkout@v2
+
     - name: Set up JDK 1.8
       uses: actions/setup-java@v1
       with:
         java-version: 1.8
- 
+
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
+
     - name: Build with Gradle
       run: ./gradlew build
-    
-    - name: Build and Push docker image
+
+    - name: Build and Push Docker Image
       uses: mr-smithers-excellent/docker-build-push@v4
       with:
         image: nanajanashia/demo-app
         registry: docker.io
         username: ${{ secrets.DOCKER_USERNAME }}
-        password: ${{ secrets.DOCKER_PASSWORD }}   
+        password: ${{ secrets.DOCKER_PASSWORD }}
+