feat: add new reusable workflow, _build.yml

[ncooke3]

Add new reusable workflow that wraps the scripts/build.sh script and provides consolidated Xcode selection, simulator installation and log uploading.

• Reduce # of places that we handle Xcode versioning (down to 38 times in .github/ from 56 with this PR)
• Consolidate de-flaking logic for gem bundle installation, sim installation, build retries, and logs uploading (should reduce nightly flakes).
• Experimenting with fixing CI management for forks.

Fix #15770

#no-changelog

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[ncooke3]

45e7793 was green.

[ncooke3]

global tap had two unrelated flakes a6ab2b7

[paulb777]

Looks like the Storage integration tests are NOT running https://github.com/firebase/firebase-ios-sdk/actions/runs/21367091022/job/61501729416

[ncooke3]

Looks like the Storage integration tests are NOT running https://github.com/firebase/firebase-ios-sdk/actions/runs/21367091022/job/61501729416

@paulb777, great catch! That's not good. I think it's related to my check_secrets.sh changes. Converting to draft.

[ncooke3]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new reusable workflow _build.yml and refactors the logic for checking secrets availability in CI environments. The new logic in check_secrets.sh is a significant improvement, making the process more explicit and robust, especially for handling builds from forks. I've added one minor suggestion to simplify the conditional logic for improved readability.

[ncooke3]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a more robust mechanism for checking secret availability in CI within scripts/check_secrets.sh. The changes prioritize new, explicit environment variables while retaining backward compatibility for older workflows, which is a solid approach for managing CI configurations, especially with forks. The code is well-commented and the logic is sound. I have a couple of minor suggestions to make the shell script syntax slightly more concise.

[ncooke3]

/gemini review

[ncooke3]

• Check actions tab for branch

[gemini-code-assist]

Code Review

This pull request introduces a more robust mechanism for checking the availability of secrets in the CI environment, which is particularly useful for handling builds from forked repositories. The changes in scripts/check_secrets.sh prioritize new, explicit environment variables for this check, while maintaining backward compatibility for older workflows. This is a solid improvement for CI reliability. I have one minor suggestion to enhance the readability of the new logic.

[laike9m]

This is a great initiative to consolidate the build logic into a reusable workflow. It significantly reduces duplication and improves maintainability.

I've identified a few issues, most notably a potential bug in the repository name comparison due to case sensitivity in bash, and some opportunities for optimization regarding simulator downloads and build retries.