Makefile: Ignore `docker` subdirectory when creating source archive

rabbitmq-prometheus has such a directory. In this case, it is quite
large and does not contain files used at build time.

1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index bfb8352da3..55a5ca42f0 100644
--- a/Makefile
+++ b/Makefile
@@ -119,6 +119,7 @@ RSYNC_FLAGS += -a $(RSYNC_V)		\
 	       --exclude 'cover/'			\
 	       --exclude 'deps/'			\
 	       --exclude 'doc/'				\
+	       --exclude 'docker/'			\
 	       --exclude 'ebin/'			\
 	       --exclude 'erl_crash.dump'		\
 	       --exclude 'escript/'			\