jenkins-common: fix_perms: chown files too

Ensure the user that runs docker owns files in cache and data dirs
during fix_perms, if an old job created them as root.

Change-Id: I43af48bd87e27abad5ad52e734256d78651f67c3

jenkins-common.sh

@@ -386,7 +386,10 @@ fix_perms() {
 			-v $CACHE_DIR:/cache \
 			--name ${BUILD_TAG}-cleaner \
 			"debian:$DEBIAN_DEFAULT" \
-			chmod -R a+rX /data/ /cache/
+			sh -e -x -c "
+				chmod -R a+rX /data/ /cache/
+				chown -R $(id -u):$(id -g) /data /cache
+			"
 }
 
 collect_logs() {