gitlab-ci: check gradle checksums against official list

.gitlab-ci.yml

@@ -198,3 +198,21 @@ fedora_latest:
     - cd tests
     - su testuser --login --command
         "cd `pwd`; export ANDROID_HOME=$ANDROID_HOME; fdroid=~testuser/.local/bin/fdroid ./run-tests"
+
+gradle:
+  image: alpine:3.7
+  variables:
+    LANG: C.UTF-8
+  script:
+    - apk add --no-cache ca-certificates git python3
+    # if this is a merge request fork, then only check if makebuildserver changed
+    - if [ "$CI_PROJECT_NAMESPACE" != "fdroid" ]; then
+        git fetch https://gitlab.com/fdroid/fdroidserver.git;
+        for f in `git diff --name-only --diff-filter=d FETCH_HEAD...HEAD`; do
+           test "$f" == "makebuildserver" && export CHANGED="yes";
+        done;
+        test -z "$CHANGED" && exit;
+      fi
+    - python3 -m ensurepip
+    - pip3 install beautifulsoup4 requests
+    - ./tests/gradle-release-checksums.py