Use GitHub Actions instead of Travis CI (retry)

[deivid-rodriguez]

Code from #38 adapted to verify how webrick is doing on jruby.

(Got here from rubygems/rubygems#3451).

[deivid-rodriguez]

Marking this as a draft since I'm just experimenting with jruby.

[headius]

Any luck on getting this further along?

[deivid-rodriguez]

No :(

My intention was not to try to fix webrick tests against jruby, only to verify that they were failing.

[deivid-rodriguez]

@hsbt Should I get these changes ready (excluding jruby), so that we can migrate to Github Actions?

[headius]

I have filed jruby/jruby#6248 which discusses the test_cgi failure. In short it won't be possible to support arbitrary bytes passed via environment variables (as is the case in the quoted test_cgi example) without JRuby bypassing the JDK's own environment variable support.

I believe the test in question should have its exclusion expanded to the "java" platform for now, since there's no timeline for us to reimplement environment variable support in JRuby.

webrick/test/webrick/test_cgi.rb

Line 46 in bfac1ad

unless RUBY_PLATFORM =~ /mswin|mingw|cygwin|bccwin32/

Note also jruby/jruby#6246 which should fix the remaining failures (I'm down to about 4 or 5).

[deivid-rodriguez]

@hsbt I updated this PR to limit it to only migrating the current TravisCI configuration to Github Actions. Let me know!

[hsbt]

Seems fine. Thanks!