Improve SSI

[lloeki]

What does this PR do?

General improvements to the current SSI injector bootstrap implementation

Motivation:

Some things are not quite covered.

Change log entry

Additional Notes:

How to test the change?

It's a bit hard right now, either we have small granularity CI but a lot of environmental invasion (rspec) or we have isolation but coarse granularity (vaccine). Working on it.

[github-actions]

👋 Hey @lloeki, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2025-06-17 14:01:11 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: lloeki/ssi
Commit report: 481cf7f
Test service: dd-trace-rb

✅ 0 Failed, 21765 Passed, 1296 Skipped, 4m 38.86s Total Time

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.53%. Comparing base (783b428) to head (2707abf).
Report is 60 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4366      +/-   ##
==========================================
- Coverage   97.56%   97.53%   -0.03%     
==========================================
  Files        1486     1484       -2     
  Lines       88592    88498      -94     
  Branches     4589     4588       -1     
==========================================
- Hits        86431    86315     -116     
- Misses       2161     2183      +22     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-30 17:15:44

Comparing candidate commit 2707abf in PR branch lloeki/ssi with baseline commit 783b428 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 41 metrics, 6 unstable metrics.

[TonyCTHsu]

Before its completion, it should be versioned with SHA or tag to be deterministic.