Adjust .gitignore

Related to 410a915a8a

.gitignore

@@ -2,6 +2,10 @@
 !/inventory/.gitkeep
 !/inventory/host_vars/.gitkeep
 !/inventory/scripts
-/roles/*/files/scratchpad
+/roles/**/files/scratchpad
 .DS_Store
 .python-version
+
+# ignore roles pulled by ansible-galaxy
+/roles/galaxy/*
+!/roles/galaxy/.gitkeep