feat(ci): use tokenless Codecov OIDC upload for public repos - #248
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Public projects authenticate Codecov uploads via GitHub OIDC (id-token: write + use_oidc: true) instead of a stored CODECOV_TOKEN, eliminating the secret. Private projects that opt into Codecov keep the token path (OIDC/tokenless is the public-repo mechanism). Fast suite green; renders valid YAML for both visibilities. PRECONDITION: requires Codecov-side OIDC/tokenless to be enabled for the org's public repos. Do NOT release or fan out until verified on one canary repo, or public coverage uploads will fail.
Add a coverage job to the template repo's own tests.yml that uploads to Codecov using GitHub OIDC (use_oidc + id-token: write, no CODECOV_TOKEN). This validates the same tokenless-OIDC path this PR ships to generated public repos -- if this job's upload succeeds, OIDC is confirmed and the template-output change is safe to release + fan out. Kept out of the ci-passed roll-up so a Codecov outage cannot block merges.
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What
Public projects authenticate Codecov uploads via GitHub OIDC (
id-token: write+use_oidc: true) instead of a storedCODECOV_TOKEN, eliminating the secret. Private projects that opt into Codecov keep the token path (OIDC/tokenless is the public-repo mechanism). Applied totests.ymlandnightly.yml.This needs Codecov-side OIDC/tokenless enabled for the org's public repos. If it isn't, public coverage uploads will fail. Canary it on one repo first: generate/point one public repo at this, confirm its coverage upload succeeds via OIDC, then release + fan out.
Once validated
After it's released and fanned out,
CODECOV_TOKENcan be retired for public repos (same pattern as the changelog PAT).Verified here
Renders valid YAML for both visibilities (public →
use_oidc, private → token); codecov gating unchanged; fast suite 383 green. Structural only — the OIDC round-trip itself is what the canary must confirm.