Use Github actions instead of Travis CI (#278)

[johnkrovitch]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tickets	fixes #278
License	MIT
Doc PR

Hi,

the goal of this PR is to move the CI from Travis CI to Github Actions. It aims to have the same behavior than Travis (#278).

Two worklows has been created :

• ci.yaml : build the project, run the tests and the cs-fixer
• release.yaml : upload the schema.phar asset when a new release is created

Note :

• I am not sure why the php-cs-fixer and phpstan analye were only enabled for php 8.0, so it is now enabled for php 7.4 (but it can be easily reverted)

[dunglas]

Thanks for handling this!! I made a few comments but it looks very promising.

[johnkrovitch]

Changes done. Do you want that the release workflow create the release or just upload release asset ?

[dunglas]

If it can create the release when a tag is created it's even better

[johnkrovitch]

The release workflow has been changed : it creates now a new release when a tag is pushed, and still upload release assets (schema.phar).

I'm not sure what to do about the changelog, should it be generated automatically or manually by a maintainer ?

[dunglas]

Thanks @johnkrovitch! Regarding the changelog, we currently handle it manually.