fix(git.go): remove space

it was causing the git-receive hook to fail to start up, with errors
like:

remote: hooks/pre-receive: line 25:
d579e5bb902c4b3299db6c6cb64a9adf940b3481: command not found

Author: arschles

pkg/git/git.go

@@ -51,7 +51,7 @@ do
 		SSH_CONNECTION= \
 		SSH_ORIGINAL_COMMAND=$SSH_ORIGINAL_COMMAND \
 		REPOSITORY=$RECEIVE_REPO \
-		SHA= $newrev \
+		SHA=$newrev \
 		USERNAME=$RECEIVE_USER \
 		FINGERPRINT=$RECEIVE_FINGERPRINT \
 		POD_NAMESPACE=$POD_NAMESPACE \