PSA: decommissioning of Node.js 12 infrastructure

[richardlau]

According to README.md in this repository:

The Build WG will keep build configuration required for a release line for 6 months after the release goes End-of-Life, in case further build or test runs are required. After that the configuration will be removed.

Node.js 12 went End-of-Life in April so we're approaching the end of the 6 month period and in all likelihood we're not going to be building Node.js 12 again. I plan to start cleaning up really old CI infrastructure that we kept around for Node.js 12 that is no longer used.

• [x] Disable https://ci.nodejs.org/job/node-daily-v12.x-staging/. This has been running daily to give some indication that the builds still work. Replace this with a daily job for v14.x so we're testing the earliest infrastructure we need to keep running.
• [ ] Identify and remove platforms from the CI that are no longer required for Node.js 14 onwards. This will help with things like https://github.com/nodejs/build/issues/3030 where End-of-Life operating systems do not provide later versions of Java in their package repositories.

[mhdawson]

Thanks for doing this.

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