Clean up old TRAVIS_* envvars

[twodarek]

We no longer use TravisCI, so these envvars had their values patched over from GITHUB envvars. It makes more sense to use the correct envvars initially.

Part of: https://github.com/Expensify/Expensify/issues/514581#issuecomment-3329458321

Explanation of Change

Mapping:

TRAVIS_RUNNING - (bool) getenv('GITHUB_SHA'))
TRAVIS_COMMIT - GITHUB_SHA
TRAVIS_BRANCH - GITHUB_REF

Related Issues

Deployment

• I followed the steps in the README to ensure this PR is deployed properly

[inimaga]

Style issues to be fixed. Otherwise, rest of code looks good to me. Also see Florent's comment on variable naming.

[twodarek]

Style issues to be fixed

@inimaga Oddly enough, the CI job isn't actually telling me what style things need fixing. From the output, it looks like it actually passes, then returns a non-0 error code

[twodarek]

I really don't know what's going on with the style checker, because it checks clean on my local:

vagrant@expensidev-2404:/vagrant/Bedrock-PHP$ vendor/bin/php-cs-fixer check
PHP CS Fixer 3.75.0 Persian Successor by Fabien Potencier, Dariusz Ruminski and contributors.
PHP runtime: 8.3.20
Running analysis on 1 core sequentially.
You can enable parallel runner and speed up the analysis! Please see usage docs for more information.
Loaded config default from "/vagrant/Bedrock-PHP/.php-cs-fixer.php".
Using cache file ".php-cs-fixer.cache".
 27/27 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%


Found 0 of 27 files that can be fixed in 0.162 seconds, 22.00 MB memory used
vagrant@expensidev-2404:/vagrant/Bedrock-PHP$ echo $?
0

Oh wait, that's CS fixer, not style fixer...

[twodarek]

vagrant@expensidev-2404:/vagrant/Bedrock-PHP$ ./ci/php-style-fixer check
PHP CS Fixer 3.75.0 Persian Successor by Fabien Potencier, Dariusz Ruminski and contributors.
PHP runtime: 8.3.20
Running analysis on 1 core sequentially.
You can enable parallel runner and speed up the analysis! Please see usage docs for more information.
Loaded config default from "/vagrant/Bedrock-PHP/.php-cs-fixer.php".
 27/27 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%


Found 0 of 27 files that can be fixed in 0.394 seconds, 22.00 MB memory used
vagrant@expensidev-2404:/vagrant/Bedrock-PHP$ echo $?
0

This is from the php-style-fixer on local. Not really sure why actions is seeings something different (maybe it's running from the main branch?)