ci: migrate to github actions

[grondo]

This PR migrates flux-sched from Travis-CI to GitHub Actions/Workflows for all CI tests.

Most of the work was already done in flux-core. I generalized docker-run-checks.sh and checks_run.sh in flux-core first (PR pending), so that those files can be copied into flux-sched (and hopefully other flux-framework projects) with minimal changes (just update the PROJECT name at the top).

I tried to keep the checks run the same as were in Travis-CI.

One thing I didn't do here was add the python format and pylint checks. This is just a straight conversion at this time.

[SteVwonder]

Thanks @grondo! LGTM! Should we wait for the generalization in flux-core to go in first? I'm assuming this is OK to go in whenever?

[grondo]

As long as they both go in eventually then future synchronization will be easier (order of PRs merged doesn't matter)

The coverage dropped here. I wonder if it is because python coverage is now supported by virtue of updating to checks_run.sh from flux-core...

[grondo]

Looks like the drop is due to hlapi/bindings (perhaps?) Was this source ignored before?

[grondo]

Feel free to set MWP when you are ready, if you want to leave the coverage investigation for later.

[grondo]

I fixed a typo in src/test/checks_run.sh. This will need to manually merged.

[codecov]

Codecov Report

Merging #794 (c1ef699) into master (b8ba989) will decrease coverage by 0.9%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #794     +/-   ##
========================================
- Coverage    73.5%   72.5%   -1.0%     
========================================
  Files          81      85      +4     
  Lines        8562    8813    +251     
========================================
+ Hits         6298    6395     +97     
- Misses       2264    2418    +154     

Impacted Files	Coverage Δ
resource/hlapi/bindings/c/reapi_cli.cpp	0.0% <0.0%> (ø)
resource/utilities/grug2dot.cpp	0.0% <0.0%> (ø)
resource/hlapi/bindings/c/reapi_module.cpp	0.0% <0.0%> (ø)
src/cmd/flux-tree-helper.py	93.2% <0.0%> (ø)
qmanager/modules/qmanager_callbacks.cpp	78.2% <0.0%> (+0.6%)	⬆️

[grondo]

I think the coverage change here can be explained by the fact that the old coverage method seemed to ignore sources that had 0 coverage, i.e. those that aren't run at all, while (somehow) the coverage in this PR finds the following "new" files:

 New file resource/hlapi/bindings/c/reapi_module.cpp
 New file resource/hlapi/bindings/c/reapi_cli.cpp
 New file resource/utilities/grug2dot.cpp
 New file src/cmd/flux-tree-helper.py

flux-tree-helper.py can be explained because updating docker-run-checks.sh from flux-core adds support for Python coverage. I'm not sure why the other files (which seem to be unused) are ignored on the main branch but found by codecov here.

[SteVwonder]

while (somehow) the coverage in this PR finds the following "new" files:

Thanks for digging into that @grondo!

This will need to manually merged.

Pushing the button.

[grondo]

Thanks!