Migrate travis to github actions

[alexander-schranz]

See CI in alexander-schranz#1

[dbu]

thanks. i think something with the matrix is odd here, and i think we lose the lowest version build.

can you please check the builds in your fork? it looks like the last version messed up something with jackrabbit - maybe it was a temporary hickup? as you seem to not have changed anything about how it gets installed...

[dbu]

i think this should be rewritten to the composer flag --prefer-lowest to be only used on the lowest php version instead.

[alexander-schranz]

Yeah I think the combiniation between include and normal matrix is buggy in github action I moved all to the include now.

[dbu]

the last travis-ci build worked: https://travis-ci.com/github/jackalope/jackalope-jackrabbit/jobs/434093834

but that was 2 months ago. i now restarted it to see if the jackrabbit problem is with the changes here or with what we get when downloading

[dbu]

hm. still green. can you check how you install and start jackrabbit and how it was done before? looks like something has changed

[alexander-schranz]

@dbu downgraded ubuntu now its running again. could not find out why it is not working with ubuntu 20 🙈

[dbu]

thanks! weird, no idea why that is. but as long as the tests run, i am happy. lets hope ubuntu 18 stays available for a while still...