Fix permissions when collecting logs

Use the debian-jessie-build container to ensure all files under
${VOL_BASE_DIR} are readable.
Call this directly from collect_logs so we handle all ttcn3 jobs.

Fixes: OS#3800
Change-Id: I124c554eee69ec5586547d3c96b8ec571e0653a7

jenkins-common.sh

@@ -29,7 +29,18 @@ network_remove() {
 	docker network remove $NET_NAME
 }
 
+fix_perms() {
+	docker_images_require debian-jessie-build
+	echo Fixing permissions
+	docker run 	--rm \
+			-v $VOL_BASE_DIR:/data \
+			--name ${BUILD_TAG}-cleaner \
+			$REPO_USER/debian-jessie-build \
+			chmod -R a+rX /data/
+}
+
 collect_logs() {
+	fix_perms
 	cat "$VOL_BASE_DIR"/*/junit-*.log || true
 }