* new workflow and adjust node builder
* fix examples by fixing artifacts script
* use-nodes instead of use-substrate
* update yamls
* build polkadot
* remove the on-push trigger again, now that polkadot built in the CI
* add default implementation again
* try composite action to avoid dupe use-substrate code
* put use-substrate in a folder
* required 'shell' prop
* re-use use-substrate action across CI
* remove unnecessary bit from action readme