Add src/test/docker/pgdata to .gitignore

Change-Id: Ifcf3d55a5f6dbb6e5b69d1549b93e56bb214880b
diff --git a/.gitignore b/.gitignore
index 30da2c2..f9af6fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,6 @@
 /bazel-testlogs
 /bazel-high-availability
 /eclipse-out/
+/src/test/docker/pgdata
+/src/test/docker/shareddir
+/src/test/docker/gitvolume