BUILD-10774: Changes default value of fallback-to-default-branch flag to true

[bwalsh434]

What Changed?

• Changes default value of fallback-to-default-branch flag to true

Test Plan

• This flag being set to true has already been extensively tested in previous PRs

[sonar-review-alpha]

Summary

This PR changes the default value of the fallback-to-default-branch input from false to true in the GitHub Action. This means cache lookups will now automatically fall back to the default branch cache when no exact match is found on the current branch (S3 backend only), unless explicitly disabled. The change is reflected in both the action configuration and documentation.

What reviewers should know

The changes are minimal and isolated: (1) action.yml line 37 changes the default, and (2) README.md line 77 updates the documentation table. Verify that both files are consistent with the new default. Since the author notes this behavior has been extensively tested in previous PRs, focus on confirming the change is intentional and complete — no other references to this default need updating.

---

• Generate Walkthrough
• Generate Diagram

🗣️ Give feedback

[sonar-review-alpha]

Conclusion

Clean, minimal change — the default flip is consistent across action.yml and README.md, and the flag's existing semantics and documentation are unchanged.

🗣️ Give feedback

[sonarqubecloud]

SonarQube reviewer guide

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqube-cloud-us]

SonarQube reviewer guide

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonar-review-alpha]

Conclusion

Straightforward default-flip with matching doc update. Both files are consistent. No issues found.

🗣️ Give feedback