feat: pin GitHub Actions to SHA digests and add pin-check workflow

[rebEllieous]

What

Pin all GitHub Actions workflows to SHA digests and enforce pinning via CI.
Closes #33
see opendefensecloud/dev-kit#14 for upstream PR of config

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 70c213c0-0b62-4cd6-8b07-76f1bcb6875b

📥 Commits

Reviewing files that changed from the base of the PR and between a9018fc and 925ddb0.

📒 Files selected for processing (12)

• .github/workflows/conventional-commits.yml
• .github/workflows/docker.yaml
• .github/workflows/docs-develop.yaml
• .github/workflows/docs-release.yaml
• .github/workflows/golang.yaml
• .github/workflows/helm-lint.yaml
• .github/workflows/helm-publish.yaml
• .github/workflows/issues-add-to-project.yml
• .github/workflows/osv-scanner.yml
• .github/workflows/release-drafter.yaml
• .github/workflows/release.yaml
• .github/workflows/update-action-pins.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/33-pin-gh-actions

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[coveralls]

Coverage Report for CI Build 26218192320

Coverage increased (+0.06%) to 71.616%

Details

• Coverage increased (+0.06%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	3280
Covered Lines:	2349
Line Coverage:	71.62%
Coverage Strength:	28.67 hits per line

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💛 - Coveralls