Fix save-state
, set-output
and Node.js 12 actions deprecation warnings
#361
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::save-state
and::set-output
in Github actions have been deprecated. The first commit replaces with Github's recommended Environment files.The second commit upgrades the actions actions/checkout@v2 and docker/build-push-action@v2 that are both using the aforementioned deprecated
::save-state
and::set-output
as well being based on Node.js 12 that's also deprecated.By merging this PR, the annotations in the Summary page of the previous run should be fixed; See sample run https://github.com/SamuelMwangiW/expose/actions/runs/3850300033