ci/build-one: accept arbitrary commit input; publish to nightly-bisect-* tag

[widgetii]

Summary

PR-Bld-C of three in the mirror of OpenIPC/firmware's nightly redesign. Mirrors OpenIPC/firmware#2116. Tiny CI-only change: build-one.yml gains an optional commit workflow_dispatch input, enabling git bisect run to drive sub-nightly granularity rebuilds.

What changes

• New optional input commit: (SHA). When set, checkout pulls that ref.
• New resolve job computes the upload tag once and threads it via job outputs:
  • With commit: nightly-bisect-<short> (deterministic per commit, prerelease)
  • Without commit: nightly-bisect-<short>-<UTC ts> (so repeated one-offs of the same HEAD don't collide).
• Upload becomes prerelease with a structured body (sha=/short=/platform=/one_off=true).
• Retry budget bumped to match PR-Bld-A (30 60 120 300 600 1200).
• BUILD_ID / BUILD_SHA / BUILD_PLATFORM env at the build step (forward-compat with Phase 3 of the mirror plan).
• Drops dead workflow-level env: TAG_NAME: latest.

Tag namespace separation

nightly-bisect-* is deliberately distinct from nightly-YYYYMMDD-<short> (the dated nightlies produced by master.yml after #91):

• enrich_manifest.py (PR-Bld-B, ci/nightly: manifest aggregator + 90-build retention sweep #92) filters strictly on ^nightly-[0-9]{8}-[0-9a-f]{7}$, so nightly-bisect-* releases never enter manifest.{json,flat}.
• cleanup.yml (PR-Bld-B) uses the same regex, so the 90-build retention sweep leaves them alone. One-off bisect builds persist until you delete them manually.

Use it

# Single platform, single commit:
gh workflow run build-one.yml -f platform=gk7205v200_fpv_caddx-fly -f commit=<sha>

Test plan

• CI passes (YAML parse).
• After merge, dispatch with platform=<x> -f commit=<sha> → builds that ref, publishes to nightly-bisect-<short> (deterministic).
• Dispatch with platform=<x> and no commit → builds HEAD, publishes to nightly-bisect-<short>-<ts>.
• After PR-Bld-A + PR-Bld-B both merge: verify dated nightly index on gh-pages is unchanged (no nightly-bisect-* entries in manifest.flat).

See also

• Companion plan: ~/.claude/plans/mirror-nightly-redesign-to-builder.md.
• Sibling PRs: ci/nightly: SHA-gate cron, publish dated nightly-* releases, BUILD_ID env #91 (PR-Bld-A), ci/nightly: manifest aggregator + 90-build retention sweep #92 (PR-Bld-B).

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