ci: add Makefile and integrate with GitHub workflows

[krtkvrm]

Summary

• Add Makefile with common CI tasks (fmt, test, race, lint, ci)
• Replace manual commands in GitHub workflows with make targets
• Provides consistent development experience between local and CI

[krtkvrm]

partially helping solve #281

[jba]

I'm sorry, but this feels like overkill. You've got a complex makefile that people must understand and maintain, but there is no compelling reason for make—no real dependencies other than what the go command already handles.

If you want to add something to our workflow, add go vet and staticcheck to our lint step.

[krtkvrm]

Thanks for the feedback! I understand the complexity concern. The Makefile is just shortcuts so contributors don't have to remember go test -v ./... every time or figure out the race detector command. Makes it easier to run the same stuff that CI does locally.

Will definitely add go vet and staticcheck to the lint step. Mind if golangci-lint gets added too? It catches a lot of issues that the others miss.

Also, would you be open to keeping just the basic targets like make test and make lint?

[jba]

Sorry, maybe I wasn't clear. No makefile.

Also, no golangci-lint. It has too many false positives.

[wkoszek]

@jba having some ci.sh or a make shortcut would be good for contributors. Instead of wasting time at #168 because I forgot some space or a tab, it'd be nice to just run a simple script to build/test everything for me.

[krtkvrm]

@jba closing this as I see staticcheck is added in CI