Use shared docker runner in build stage

.gitlab-ci.yml

@@ -9,12 +9,15 @@ build-p2:
   image: maven:3.6.3-adoptopenjdk-15
   stage: build
   script:
-    - echo "Maven Version"
     - mvn --version
+  tags: 
+    - docker
 
 pages-master:
   stage: deploy
   script:
+    - mvn --version
+    - mkdir -p "$EXPORT_DIR/$CI_PROJECT_NAME"
     - cp -r public/* "$EXPORT_DIR/$CI_PROJECT_NAME"
   tags: 
     - production