Update source mirrors so they don't run GitHub actions as frequently

[tellison]

Upstream repo code runs actions on each change to master branch, this is not required for our mirrors as we are only copying incoming code, but we do with to retain sanity checking for any local pr branches.

This issue is to cover reconfiguration of the actions on all mirrors to avoid unnecessary runs.

See also: https://github.com/adoptium/jdk/pull/7