ci: cache /tmp

Author: nhooyr

.travis.yml

@@ -36,3 +36,7 @@ deploy:
     repo: codercom/code-server
     branch: master
 cache: yarn
+  # See https://github.com/roblourens/vscode-ripgrep/blob/28112b69ce206634ee112d62e2c2c3ec7c4722ce/lib/download.js#L14
+  # Has been causing GitHub rate limit errors so we cache /tmp to avoid running it too often.
+  directories:
+    - /tmp