check if drone should run: also when build.gradle changed

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

scripts/checkIfRunDrone.sh

@@ -1,7 +1,7 @@
 #!/bin/sh -e
 
 export BRANCH=$(scripts/analysis/getBranchBase.sh $1 $2 $3 | sed s'/"//'g)
-if [ $(git diff --name-only origin/$BRANCH | grep -c "^src") -eq 0 ] ; then
+if [ $(git diff --name-only origin/$BRANCH | grep -cE "^src|build.gradle") -eq 0 ] ; then
     echo "No source files changed"
     exit 1
 else