Rename default branch about setup-java HOT 4 CLOSED

@andymckay Please keep in mind that there might be some users referencing actions/java@master in their workflows and this change would break their builds. It would be great if there could be a "soft warning" phase before the actual removal of the master branch.

Maybe it would be possible to emit a warning if people were still on the master branch, for example by emitting a warning via core.warning() for a few weeks.

Unfortunately the GitHub code search doesn't yield a useful result to see how many repositories would be affected because @ is being used to tokenize the input:
Search result for language:yaml path:".github/workflows" "actions/setup-java" +master

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@joschi Only the default branch will be changed to main. The @master branch won't be removed any time soon (no plans at all currently), we would break ALOT of users if we did that just looking at internal telemetry.

A few first party actions have already changed to main such as upload-artifact, download-artifact and checkout. Expect no side-effects. Users tied to @master just won't get the latest updates unless they switch to @main or a specific tag.

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@konradpabjan Thanks a lot for the clarification!

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I've updated the branch to main. I've merged in two PRs beforehand however there are still some big ones that have been languishing in sadness in despair and I need to find some time to try take a look at them😞 those will have to be rebased in the future

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