chore(devenv): More improvements to dev container workflow

[brendan-kellam]

Summary by CodeRabbit

• Chores
  • Updated development container configuration with environment variables and reorganized startup commands.
  • Enhanced post-creation setup workflow to include database migrations and default configuration generation.
  • Added code formatting configuration with 4-space tab width.
  • Improved development server settings for localhost compatibility.

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[github-actions]

@brendan-kellam your pull request is missing a changelog!

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Updates development environment configuration across multiple files: adds a new Prettier config for code formatting, enhances the dev container setup with environment variables and additional initialization steps (database migrations and config generation), and introduces development-specific Next.js server actions configuration.

Changes

Cohort / File(s)	Summary
Dev Container Configuration .devcontainer/devcontainer.json, .devcontainer/scripts/post-create.sh	Restructured devcontainer configuration with dynamic AUTH_URL environment variable. Expanded post-create script from 2 to 4 steps, adding database migration and config.json generation. Updated VSCode extensions and formatting preferences.
Code Formatting .prettierrc	New Prettier configuration file setting tab width to 4 spaces.
Next.js Configuration packages/web/next.config.mjs	Added development-only conditional configuration block enabling experimental server actions for localhost:3000 when NODE_ENV is 'development'.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bkellam/devcontainer_improvements

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