Add A-github-actions label

[lopopolo]

There are many tickets that manage or track GitHub Actions changes that aren't GitHub infrastructure as code (A-github label).

For example:

• Remove dependencies on actions-rs GitHub Actions #265
• Update rustdoc workflow to deploy docs with GitHub Actions #358

[lopopolo]

laberler dry run:

🏃 Running GitHub Labeler
[dryrun] ✅ Skipping update for 'A-aws' label. Same color and description
[dryrun] ✅ Skipping update for 'A-build' label. Same color and description
[dryrun] ✅ Skipping update for 'A-deps' label. Same color and description
[dryrun] ✅ Skipping update for 'A-dns' label. Same color and description
[dryrun] ✅ Skipping update for 'A-email' label. Same color and description
[dryrun] ✅ Skipping update for 'A-github' label. Same color and description
[dryrun] 🎨 Creating 'A-github-actions' label with color 'f7e101' and desc 'Area: GitHub Actions workflows and automation.'
[dryrun] ✅ Skipping update for 'A-google-domains' label. Same color and description
[dryrun] ✅ Skipping update for 'A-google-workspace' label. Same color and description
[dryrun] ✅ Skipping update for 'A-packaging' label. Same color and description
[dryrun] ✅ Skipping update for 'A-project' label. Same color and description
[dryrun] ✅ Skipping update for 'A-release' label. Same color and description
[dryrun] ✅ Skipping update for 'A-security' label. Same color and description
[dryrun] ✅ Skipping update for 'A-terraform' label. Same color and description
[dryrun] ✅ Skipping update for 'C-bug' label. Same color and description
[dryrun] ✅ Skipping update for 'C-docs' label. Same color and description
[dryrun] ✅ Skipping update for 'C-enhancement' label. Same color and description
[dryrun] ✅ Skipping update for 'C-quality' label. Same color and description
[dryrun] ✅ Skipping update for 'C-question' label. Same color and description
[dryrun] ✅ Skipping update for 'E-easy' label. Same color and description
[dryrun] ✅ Skipping update for 'E-medium' label. Same color and description
[dryrun] ✅ Skipping update for 'E-hard' label. Same color and description
[dryrun] ✅ Skipping update for 'E-help-wanted' label. Same color and description
[dryrun] ✅ Skipping update for 'E-needs-test' label. Same color and description
[dryrun] ✅ Skipping update for 'S-archive' label. Same color and description
[dryrun] ✅ Skipping update for 'S-blocked' label. Same color and description
[dryrun] ✅ Skipping update for 'S-do-not-merge' label. Same color and description
[dryrun] ✅ Skipping update for 'S-duplicate' label. Same color and description
[dryrun] ✅ Skipping update for 'S-invalid' label. Same color and description
[dryrun] ✅ Skipping update for 'S-postponed' label. Same color and description
[dryrun] ✅ Skipping update for 'S-speculative' label. Same color and description
[dryrun] ✅ Skipping update for 'S-stale' label. Same color and description
[dryrun] ✅ Skipping update for 'S-wip' label. Same color and description
[dryrun] ✅ Skipping update for 'S-wontfix' label. Same color and description