ci: add renovate auto-approve caller workflow

[cbrgm]

What

• adds the renovate auto-approve caller workflow -> calls dev-kit's reusable renovate-auto-approve.yml (feat: add reusable renovate-auto-approve workflow dev-kit#25), pinned to 8cb6197 (post-v1.0.13 re-pin to the next release tag once cut, noted in the file)
• created the missing automerge label

Why

The renovate-config presets set automerge: true + the automerge label on digest/patch/minor PRs, but Renovate cant approve its own PRs, so the required-review gate never clears. This workflow provides that approval for labeled PRs; anything labeled security is skipped and an earlier approval revoked

Everything else was already in place, verified via API: "Allow GitHub Actions to approve PRs" enabled, protect-main requires 1 approval + check/lint/test/CodeQL, allow_auto_merge on -> merges stay gated on CI, majors and security updates stay human-gated.

Related: automerge policy (labels, update types, stability window) -> opendefensecloud/renovate-config#14, reusable workflow -> opendefensecloud/dev-kit#25.

Testing

CI config only, no runnable behavior change
YAML parses clean, uses: ref resolves to the merged dev-kit workflow.

Checklist

• Tests added/updated (not applicable, CI config only)
• No breaking changes
• Readable commit history (squashed and cleaned up as desired)
• AI code review considered and comments resolved

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e5a5fc36-2cae-4ce3-b39b-a6c216df3e2f

📥 Commits

Reviewing files that changed from the base of the PR and between 8e3f8cb and be6d8a6.

📒 Files selected for processing (1)

• .github/workflows/renovate-auto-approve.yml

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