fix: allow overriding release name via GitHub Actions UI

otherwise, it will always default to "main"

Author: OmarIthawi

Makefile

@@ -3,7 +3,7 @@ validate_translation_files test_requirements test fix_transifex_resource_names_d
 retry_merge_transifex_bot_pull_requests
 
 # Default release/project to work on. Override to release project e.g. `zebrawood` when cutting a release.
-export RELEASE := main
+export RELEASE ?= main
 
 piptools:
 	pip install -q -r requirements/pip_tools.txt