Use create-pull-request v2

[tkf]

Commit Message

Use create-pull-request v2 (#322)

Using SSH-based configuration (which quires create-pull-request v2) so
that commits from this workflow will trigger actions. With ssh-key
is passed to actions/checkout@v2, git commands cannot be used inside
docker anymore (tkf/julia-merge-except-manifests@v1). So, just
inlining the script for now.

This is based on:
tkf/ThreadsX.jl#112
tkf/ThreadsX.jl#114
tkf/ThreadsX.jl#115

[codecov]

Codecov Report

Merging #322 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #322   +/-   ##
=======================================
  Coverage   90.34%   90.34%           
=======================================
  Files          24       24           
  Lines        1461     1461           
=======================================
  Hits         1320     1320           
  Misses        141      141           

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