docs: add blog post about automating agentic coding via GitHub Actions

[bhouston]

Description

This PR adds a new blog post titled "Automating Agentic Coding via GitHub Actions" that explores how MyCoder can be integrated into GitHub Actions to automate various aspects of the development workflow.

The blog post covers:

• The current GitHub Action integration in MyCoder
• Real-world examples using issues Allow for multiple line custom prompts in mycoder.config.js #249/feat: support multiple line custom prompts in mycoder.config.js #250 and Allow custom cli commands to be defined #251/Add custom CLI commands feature #252
• Potential future applications of agentic automation
• How this approach can benefit enterprise and medium-sized business coding workflows

Changes

• Added a new blog post in blog/automating-agentic-coding-via-github-actions.md
• Installed missing 'ollama' dependency in the agent package to fix build errors

This blog post helps showcase the practical applications of MyCoder beyond just IDE-based assistance, highlighting its potential for workflow automation.

Closes #255