ci(provenance): auto-create v<version> tag after socket publish

[John-David Dalton (jdalton)]

Summary

• Adds a Tag release (idempotent) step at the end of the v1.x publish workflow to auto-create v<version> git tags after a successful socket npm publish.
• Idempotent: no-op if tag already exists at the published SHA; hard-fail if it exists at a different SHA (GitHub Release Immutability means moving it is unsafe).
• Uses gh api (not git push) so the GITHUB_TOKEN only lives in the tag step's env block — never written to .git/config where pnpm install postinstall scripts could read it.
• Gated on steps.publish_socket.outcome == 'success': the other two publishes (@socketsecurity/cli, cli-with-sentry) use continue-on-error: true and don't represent the v<version> tag.

Mirrors the patch landed on main (8043cf7) and socket-registry/provenance.yml. Inlined here rather than reusing socket-registry/.github/workflows/provenance.yml because v1.x is intentionally decoupled from the reusable workflow's evolution.

Test plan

• actionlint passes (verified locally — only the pre-existing options: warning on the debug input, unrelated).
• zizmor passes (verified locally — no findings).
• Next v1.x publish that flips inputs.socket true creates a v<cli_version> tag pointing at the published SHA.
• Re-running the workflow against the same published version no-ops (idempotency).

Why

socket-cli 1.1.98 and 1.1.99 were published from this branch with no git tags on origin — had to be hand-created on 2026-05-20 by reading npm view socket@<v> gitHead and git tag -s vX.Y.Z <sha>. Two published versions in a row with missing tags is a fleet-wide failure mode; the publish path needs to enforce tag creation, not rely on operator memory.

---

Note

Medium Risk
Moderate risk because it changes CI publish permissions and adds automated tag creation; mistakes could create/lock incorrect tags or fail the release pipeline under GitHub Release immutability.

Overview
After a successful socket npm publish, the provenance workflow now creates an idempotent v<version> git tag pointing at the published commit SHA (no-op if already correct; hard-fail if the tag exists at a different SHA).

To support this, the job permission contents is raised to write, and the first publish step is given an id (publish_socket) so the tag step can be gated on its success while the other publishes remain continue-on-error.

^{Reviewed by Cursor Bugbot for commit 7e12956. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: 404 response body breaks tag existence check
  • Split the command substitution from the fallback ($(gh api ...) || EXISTING_JSON="") so that on a 404 the variable is explicitly overwritten to empty, preventing the non-empty check from passing with the error JSON body.

Or push these changes by commenting:

@cursor push bad849d7f8

Preview (bad849d7f8)

diff --git a/.github/workflows/provenance.yml b/.github/workflows/provenance.yml
--- a/.github/workflows/provenance.yml
+++ b/.github/workflows/provenance.yml
@@ -258,7 +258,7 @@
           TAG="v$PUBLISHED_VERSION"
 
           # Look up any existing tag via the API. 200 → exists; 404 → absent.
-          EXISTING_JSON=$(gh api "repos/$REPO/git/ref/tags/$TAG" 2>/dev/null || echo "")
+          EXISTING_JSON=$(gh api "repos/$REPO/git/ref/tags/$TAG" 2>/dev/null) || EXISTING_JSON=""
           if [ -n "$EXISTING_JSON" ]; then
             EXISTING_SHA=$(echo "$EXISTING_JSON" | node -p "JSON.parse(require('fs').readFileSync(0,'utf8')).object.sha")
             if [ "$EXISTING_SHA" = "$PUBLISHED_SHA" ]; then

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^{Reviewed by Cursor Bugbot for commit 7e12956. Configure here.}