Don't fail docs-linux on release branches (#64203)

dev/bots/docs.sh

@@ -9,7 +9,7 @@ function deploy {
   local total_tries="$1"
   local remaining_tries=$(($total_tries - 1))
   shift
-  while [[ "$remaining_tries" > 0 ]]; do
+  while [[ "$remaining_tries" -gt 0 ]]; do
     (cd "$FLUTTER_ROOT/dev/docs" && firebase --debug deploy --token "$FIREBASE_TOKEN" --project "$@") && break
     remaining_tries=$(($remaining_tries - 1))
     echo "Error: Unable to deploy documentation to Firebase. Retrying in five seconds... ($remaining_tries tries left)"
@@ -103,7 +103,7 @@ function deploy_docs() {
             ;;
         *)
             >&2 echo "Docs deployment cannot be run on the $CIRRUS_BRANCH branch."
-            exit 1
+            exit 0
     esac
 }
 
@@ -160,6 +160,7 @@ if [[ -d "$FLUTTER_PUB_CACHE" ]]; then
 fi
 
 generate_docs
+# Skip publishing docs for PRs and release candidate branches
 if [[ -n "$CIRRUS_CI" && -z "$CIRRUS_PR" ]]; then
   (cd "$FLUTTER_ROOT/dev/docs"; create_offline_zip)
   # TODO(tvolkert): re-enable (https://github.com/flutter/flutter/issues/60646)