chore: add GitHub Actions VS Code extension

[HonkingGoose]

Changes

• Add the official GitHub Actions VS Code extension to devcontainer
• Add the official GitHub Actions VS code extension to the VS Code recommended extensions config

Context

Works:

• Integrated docs

Broken:

• Syntax highlighting (at least in Codespaces)

Important stuff

I'll let the maintainers decide if this is something they want. I'm marking this PR as "draft" so we don't accidentally merge it without proper review. 😄

• The extension wants you to login to GitHub, thereby giving it more rights than we're probably comfortable with
• The extension is in beta
• The extension is from GitHub themselves

References

• GitHub Blog, GitHub Actions: Visual Studio Code Extension is now in public beta
• VSCode Marketplace, GitHub Actions

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[viceice]

🤷‍♂️

[renovate-release]

🎉 This PR is included in version 35.75.0 🎉

The release is available on:

• GitHub release
• 35.75.0

Your semantic-release bot 📦🚀