Use deprecated set-output syntax if GITHUB_OUTPUT environment is not available #255
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This PR solves the issue reported in #254, where the Action fails in environments not yet updated to the latest GitHub Actions runner where
$GITHUB_OUTPUT
is availbale.The PR changes the Action to first check if
$GITHUB_OUTPUT
is available. If available the new syntax is used.If
$GITHUB_OUTPUT
is missing, the now deprecated syntaxset-output
is used.set-output
is supported by GitHub until June 2023.I plan to remove this fallback code in late December 2022 with the hope, that most runners of GitHub Enterprise have been updated by then.