Fix Docker release script for Travis.

.travis.yml

@@ -171,6 +171,7 @@ jobs:
       # For the notification, configure `SLACK_WEBHOOK`
       # - `travis env set SLACK_WEBHOOK "https://hooks.slack.com/services/..."`
       after_deploy:
+        - export GRADLE_SCRIPT=$GRADLE_SCRIPT
         - travis_retry ./.travis/docker_release.sh
         - ./.travis/notify.sh
 

.travis/docker_release.sh

@@ -1,8 +1,15 @@
 #!/usr/bin/env bash
 
+if [ "${GRADLE_SCRIPT}z" == "z" ]; then
+  echo "GRADLE_SCRIPT variable is missing"
+  GRADLE_SCRIPT=gradle
+fi
+
+$GRADLE_SCRIPT --version
+
 here=$(dirname "${0}")
 pushd "${here}/.."
-TRANSMART_VERSION=$(gradle properties | grep '^version: ' - | awk '{print $2}')
+TRANSMART_VERSION=$(${GRADLE_SCRIPT} properties | grep '^version: ' - | awk '{print $2}')
 popd
 
 docker build --build-arg "TRANSMART_VERSION=${TRANSMART_VERSION}" -t "thehyve/transmart-api-server:${TRANSMART_VERSION}" "${here}/../docker/transmart-api-server" && \