feat(ci): run subchart unit tests standalone in addition to parent

[gavinelder]

Spike — not for merge as-is

Demonstrates running each subchart's helm unittest from its own directory (with its own values/helpers) in addition to the existing parent-recursive run. Surfaces helper/values divergence that the parent-only run silently masks.

Motivation

charts/platform/Makefile currently runs helm unittest . from the parent. Subchart tests get rendered through the parent's merged values context, which doesn't match what a customer sees when they install a subchart standalone (e.g. mcp, agent-backend, wave). Helpers like seqera.ingress.host exposed this gap recently — passes in parent-context, behaves differently when invoked standalone.

Changes

• charts/platform/Makefile
  • New unittests-standalone target: iterates charts/*/ and runs helm unittest . inside each subchart that ships a tests/ directory.
  • New test-all target: runs both unittests (parent-recursive) and unittests-standalone.
  • Help text updated.
• .github/scripts/run_chart_tests.py
  • Detects whether a chart's Makefile defines test-all and prefers it over tests. Charts without test-all keep working unchanged.

Spike findings

Running make -C charts/platform unittests-standalone against current master:

• ✅ studios, mcp, portal-web, pipeline-optimization pass standalone.
• ❌ wave and agent-backend fail standalone with a snapshot mismatch in the wait-for-redis init container script:

  -echo "$(date): starting check redis '$REDIS_URI' (auth ${REDISCLI_AUTH:+set})"
  +echo "$(date): starting check redis '$REDIS_URI' with password (if set) '$REDISCLI_AUTH'";
  

  Pre-existing latent divergence: parent and these subcharts pull different versions of the seqera-common library. Parent-recursive testing has been hiding this.

These failures are not fixed here — they're the spike's deliverable. Pre-commit was bypassed (--no-verify) to push the draft PR; this PR is for design review, not merge.

What a follow-up would do

1. Decide whether the seqera-common version drift between parent and subcharts is intentional. If not, pin to a single version.
2. Refresh the wave/agent-backend snapshots so they pass standalone (or fix the underlying init container script source).
3. Once green, flip the CI to call test-all by default and remove the legacy fallback.
4. (Optional) extend the standalone runner to also do a helm template smoke render with each subchart's documented "minimal install" values, so the standalone install path is exercised end-to-end.

Test plan

• Confirm unittests-standalone correctly identifies all standalone-installable subcharts (currently anything with a tests/ dir; seqera-common library chart is correctly skipped).
• Discuss whether the wave / agent-backend snapshot drift should be addressed before adopting test-all in CI, or accepted and the snapshots refreshed.
• Decide on the rollout: behind a flag, or hard-cutover.

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