Use full path when specifying Dockerfile to build

See gh-15058

ci/pipeline.yml

@@ -120,15 +120,15 @@ jobs:
   - put: spring-boot-ci-image
     params:
       build: ci-images-git-repo/ci/images
-      dockerfile: spring-boot-ci-image/Dockerfile
+      dockerfile: ci-images-git-repo/ci/images/spring-boot-ci-image/Dockerfile
   - put: spring-boot-jdk9-ci-image
     params:
       build: ci-images-git-repo/ci/images
-      dockerfile: spring-boot-jdk9-ci-image/Dockerfile
+      dockerfile: ci-images-git-repo/ci/images/spring-boot-jdk9-ci-image/Dockerfile
   - put: spring-boot-jdk10-ci-image
     params:
       build: ci-images-git-repo/ci/images
-      dockerfile: spring-boot-jdk10-ci-image/Dockerfile
+      dockerfile: ci-images-git-repo/ci/images/spring-boot-jdk10-ci-image/Dockerfile
 - name: build
   serial: true
   public: true