Yaml file extension: .yml or .yaml

[dabcoder]

Prerequisites:

• Is the functionality available in the GitHub UI?

No / N/A

• Is the functionality available through the GitHub API?

No / N/A

New Feature

The README states that files with the .yaml file extension will be ignored. Yet both .yaml and .yml are valid. Therefore, I've got a couple of suggestions:

a. Either return an error when the .yaml file extension is in use, in order to notify users they should switch to .yml.
b. Support both file extensions. Could it be around here?

[dabcoder]

Any feedback on the above?

[Technobeats]

+1 Lost some time today by accidentally creating a file with .yaml.
Strange part is .yaml is being picked up and visible in the debug-logging but not applied.
After changing it to .yml the config was applied

[dabcoder]

cc @decyjphr for visibility

[paddyroddy]

I got it working with .yaml here https://github.com/UCL-MIRSG/.github/tree/main/safe-settings

[anderssonjohan]

@dabcoder With an update to the README and added test to confirm both extensions are read and your PR looks solid to me.