Actions authors can now specify that their action can run in Node.js 16 by specifying
node16 in the action's
action.yml. This is in addition to the existing Node.js 12 support; actions can continue to specify
runs.using: node12 to use the Node.js 12 runtime.
Runners supporting Node.js 16 actions are available on all GitHub-hosted runners and in GitHub Enterprise Server 3.4 and newer. GitHub Enterprise Server 3.3 and newer can manually install a newer runner to add support for Node.js 16 based actions.
As a result, actions authors who move from targeting Node.js 12 to Node.js 16 should release with a new major version number to communicate that there is a possible breaking change for GitHub Enterprise Server 3.3 and earlier.