Change image used for build

.github/workflows/build_docker_images.yml

@@ -6,10 +6,14 @@ on:
 
 jobs:
   build:
-    runs-on: maven:latest
+    runs-on: ubuntu:latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+      - name: Set up JDK11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
       - name: Cache Maven packages
         uses: actions/cache@v2
         with:
@@ -24,7 +28,7 @@ jobs:
           name: Package
           path: staging
 
-  push:
+  docker_push:
     runs-on: ubuntu-latest
     steps:
       -