Remove packaging of maven artifacts

Bintray is shutting down soon. The artifact will be published by https://github.com/TIGERs-Mannheim/ssl-game-controller-maven

Author: g3force

.circleci/config.yml

@@ -65,19 +65,6 @@ jobs:
             go get github.com/tcnksm/ghr
             ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${CIRCLE_TAG} ./release/gh/
 
-  publish-package-maven:
-    docker:
-      - image: circleci/openjdk:11-jdk
-    steps:
-      - checkout
-      - attach_workspace:
-          at: .
-      - run:
-          name: "Publish Packages to Bintray"
-          working_directory: .circleci/pkg-maven
-          command: |
-            ./gradlew bintrayUpload --info --stacktrace
-
 workflows:
   version: 2
   main:
@@ -100,11 +87,3 @@ workflows:
               ignore: /.*/
             tags:
               only: /^v.*/
-      - publish-package-maven:
-          requires:
-            - backend
-          filters:
-            branches:
-              ignore: /.*/
-            tags:
-              only: /^v.*/