--channel=self-hosted changes Plugin Check so a self-updater is allowed, and the scaffold command writes Update URI into the plugin header. The overlay is not part of this plugin's runtime.
What the overlay adds
The overlay is one workflow file:
-
.github/workflows/-
plugin-check.yml
-
The root workflow and the overlay workflow are the same except the overlay passes exclude_checks: plugin_updater into linchpin/actions Plugin Check.
with: build_dir: ./build/plugin-scaffold build_command: bash scripts/build.sh php_version: '8.3' exclude_directories: vendor,node_modules exclude_checks: plugin_updaterUpdate URI
overlays/README.md states that the CLI also writes Update URI into the plugin header. This repository does not contain the header line or the writer. The generated plugin header is where that field appears after --channel=self-hosted.