Add coder cloud agent binary to build process

ci/build/build-release.sh

@@ -25,6 +25,7 @@ main() {
   rsync README.md "$RELEASE_PATH"
   rsync LICENSE.txt "$RELEASE_PATH"
   rsync ./lib/vscode/ThirdPartyNotices.txt "$RELEASE_PATH"
+  rsync ./lib/coder-cloud-agent "$RELEASE_PATH/lib"
 
   # code-server exports types which can be imported and used by plugins. Those
   # types import ipc.d.ts but it isn't included in the final vscode build so