chore: add hermetic RBE tests

[b3cramer]

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Changes are visible to end-users: yes/no

• Searched for relevant documentation and updated as needed: yes/no
• Breaking change (forces users to change their own code or config): yes/no
• Suggested release notes appear below: yes/no

Test plan

• Covered by existing test cases
• New test cases added
• Manual testing; please provide instructions so we can reproduce:

[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Thu Jun 25 13:44:56 UTC 2026

🔄 1 in progress task

• 🔄 test-gha [test] · ⏱ 1m 46s · ✨ Aspect · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test running... (15 tests run)

❌ 1 failed task

• ❌ test-gha-ephemeral [test] · ⏱ 2m 12s · 🐙 GitHub Actions · ☑️ Check
  💬 failed in test · Bazel test failed

✅ 8 successful tasks

• ✅ buildifier-gha [buildifier] · ⏱ 20.7s · ✨ Aspect · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ buildifier-gha-ephemeral [buildifier] · ⏱ 2m 32s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ format-gha [format] · ⏱ 43.6s · ✨ Aspect · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ format-gha-ephemeral [format] · ⏱ 1m 36s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ gazelle-gha [gazelle] · ⏱ 11.2s · ✨ Aspect · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ gazelle-gha-ephemeral [gazelle] · ⏱ 2m 49s · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ lint-gha [lint] · ⏱ 52.1s · ✨ Aspect · 🐙 GitHub Actions · ☑️ Check
  💬 Lint complete (clean)
• ✅ lint-gha-ephemeral [lint] · ⏱ 4m 52s · 🐙 GitHub Actions · ☑️ Check
  💬 Lint complete (clean)

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