Add GHA workflow, allow to select shell variant, add checks, etc.#6

Merged

Ecco merged 13 commits intonumworks:masterfrom

msys2:feat-shelltype

Oct 9, 2019

Commits on Oct 1, 2019

Add gitignore
Ecco
committed

Commits on Oct 6, 2019

update @actions/core to ^1.1.3
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Commits on Oct 8, 2019

check that the host platform is windows
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eslint does not work without a config file
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rename msys2do.cmd to msys2do.in
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add GHA workflow
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ensure that msys is initialized
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style: remove non-required variables
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check that RUNNER_TMP is not empty
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hardcode msys2do.in in index.js
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allow to select shell variant
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update README.md
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style
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