feat(ci): add trufflehog secrets detection

[McPatate]

What does this PR do?

Adding a GH action to scan for leaked secrets on each commit.

Context

trufflehog will scan the commit that triggered the CI for any token leak. trufflehog works with a large number of what they call "detectors", each of which will read the text from the commit to see if there is match for a token. For example, the hugging face detector will check for hf tokens and then query our /api/whoami{-v2} endpoint to check if the token is valid. If it detects a valid token, the CI will fail, informing you that you need to rotate the token given it leaked.

References

• https://github.com/trufflesecurity/trufflehog
• https://github.com/marketplace/actions/trufflehog-oss