ci: add step to build and verify Docker image

.github/workflows/build.yml

@@ -1,19 +1,10 @@
-name: "Build"
+name: "Pull requests build"
 on:
     pull_request:
         paths-ignore:
             - '.txt'
             - 'LICENSE'
             - 'docs/**'
-  push:
-    branches:
-      - main
-    tags-ignore:
-      - '*'
-    paths-ignore:
-      - '.txt'
-      - 'LICENSE'
-      - 'docs/**'
 
 jobs:
     pr-build:
@@ -43,24 +34,27 @@ jobs:
                     restore-keys: ${{ runner.os }}-m2-
             -   name: Build with Maven
                 run: mvn --no-transfer-progress verify
-
-  build:
-    if: github.repository == 'WebGoat/WebGoat' && github.event_name == 'push'
-    runs-on: ubuntu-latest
-    name: "Branch build"
-    steps:
-        - uses: actions/checkout@v3
-        - name: set up JDK 17
-          uses: actions/setup-java@v3
+            -   name: "Set up QEMU"
+                if: runner.os == 'Linux'
+                uses: docker/setup-qemu-action@v2.1.0
+            -   name: "Set up Docker Buildx"
+                if: runner.os == 'Linux'
+                uses: docker/setup-buildx-action@v2
+            -   name: "Verify Docker WebGoat build"
+                if: runner.os == 'Linux'
+                uses: docker/build-push-action@v4.0.0
                 with:
-              distribution: 'temurin'
-              java-version: 17
-              architecture: x64
-        - name: Cache Maven packages
-          uses: actions/cache@v3.2.5
+                    context: ./
+                    file: ./Dockerfile
+                    push: false
+                    build-args: |
+                        webgoat_version=${{ env.WEBGOAT_MAVEN_VERSION }}
+            -   name: "Verify Docker WebGoat desktop build"
+                uses: docker/build-push-action@v4.0.0
+                if: runner.os == 'Linux'
                 with:
-              path: ~/.m2
-              key: ubuntu-latest-m2-${{ hashFiles('**/pom.xml') }}
-              restore-keys: ubuntu-latest-m2-
-        - name: Test with Maven
-          run: mvn --no-transfer-progress verify
+                    context: ./
+                    file: ./Dockerfile_desktop
+                    push: false
+                    build-args: |
+                        webgoat_version=${{ env.WEBGOAT_MAVEN_VERSION }}