docs: Add "Automating DevOps" CI/CD Guide to Cookbook

[jadonamite]

e guide on setting up a production-grade CI/CD pipeline for Base using GitHub Actions.

Manual deployments from local machines are risky and non-reproducible. This guide provides a "set it and forget it" workflow that automates testing, funding, and deployment.

Key Additions
Architecture: A 3-stage pipeline (Test -> Auto-Fund -> Deploy).

Auto-Funding Script: A Node.js script using the @eth-optimism/sdk to check L2 balances and automatically bridge ETH from Sepolia L1 if the deployer wallet is running low.

Security: Best practices for managing private keys using GitHub Secrets ("Disposable Deployers").

Workflow: A complete .github/workflows/deploy.yml template compatible with Foundry.

File Changes
🆕 Created: apps/base-docs/docs/cookbook/automating-devops.mdx

Checklist
[x] Frontmatter (YAML) is correctly formatted with double quotes for titles.

[x] Code snippets (GitHub Actions YAML & Node.js) are linted.

[x] Documentation follows the existing style guide.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1