Add GH Workflow for cross-platform tests

[ibnesayeed]

This utilizes matrix of OSes, Python and IPFS versions to perform tests of various combinations.

[codecov]

Codecov Report

Merging #648 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #648   +/-   ##
=======================================
  Coverage   27.28%   27.28%           
=======================================
  Files           7        7           
  Lines        1246     1246           
  Branches      191      191           
=======================================
  Hits          340      340           
  Misses        881      881           
  Partials       25       25           

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[ibnesayeed]

It looks like Windows tests are halting. We need to test it manually on a Windows machine as following:

• Install Windows Server 2019
• Ensure Bash and cURL are installed in it
• Install NodeJS 12
• Install Python 3.7 or 3.8
• Install IPFS (i.e., download and extract the binary and set PATH accordingly)
• Run IPFS daemon
• Run ipfs cat on the welcome file
• Clone IPWB
• Run IPWB tests

[ibnesayeed]

This aims to resolve #630, but Windows environment is not behaving well. I think we can move with what we have working here and revisit Windows later.

[ibnesayeed]

@machawk1: 3.8 is problematic on some systems

That's why we are testing 3.7 and 3.8 both on various platforms using matrix, but inside a Docker container we can more confidently go for the latest Python.

[ibnesayeed]

@machawk1 should we abstract out the task of linting the code as a separate job and not repeat it in every matrix environment?

[machawk1]

@ibnesayeed Yes, only need to lint in one environment. No need to repeat.

[ibnesayeed]

@machawk1 this is in good shape (other than Windows, which is commented out for now).

[machawk1]

@ibnesayeed I should have some time to explore and evaluate this tomorrow (May 14) afternoon.

[ibnesayeed]

It looks like the codecov utility is a not an independent tool, but a way to submit results to codecov.io for reporting, hence removing it from the workflow.

[ibnesayeed]

Windows tests are still failing and taking forever to complete, likely due to IPWB bugs (because the action otherwise runs tests on all platforms fine).

[machawk1]

LGTM