Install TagBot as a GitHub Action

[JuliaTagBot]

You're receiving this pull request because the now-deprecated Julia TagBot GitHub App is installed for this repository. This pull request installs TagBot as a GitHub Action. If this PR does not belong in this repository for any reason, feel free to close it.

See this Discourse thread for more details and to ask questions. Please do not comment on this pull request, because it is unlikely that I (@christopher-dG) will see it.

[codecov-io]

Codecov Report

Merging #5 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #5   +/-   ##
=======================================
  Coverage   46.31%   46.31%           
=======================================
  Files          22       22           
  Lines         637      637           
=======================================
  Hits          295      295           
  Misses        342      342

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