Feat: cache workflow file

[S1ro1]

No description provided.

[Copilot]

Pull request overview

This PR introduces a caching mechanism for GitHub workflow file lookups to reduce redundant API calls when triggering workflows. The implementation adds a module-level cache dictionary and a new get_workflow() method that checks the cache before fetching from the GitHub API.

Key changes:

• Introduces _WORKFLOW_FILE_CACHE module-level dictionary to store Workflow objects
• Adds get_workflow() async method to retrieve cached workflows or fetch from GitHub
• Updates trigger() method to use the new caching mechanism instead of direct API calls

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[Copilot]

The get_workflow method is declared as async but doesn't perform any await operations. Line 222 calls self.repo.get_workflow synchronously, which is a blocking network I/O operation that was previously wrapped with asyncio.to_thread at line 246. Removing the asyncio.to_thread wrapper without making the method properly async means this now blocks the event loop. Either add back the asyncio.to_thread wrapper, or change this to a synchronous method if blocking is acceptable.

Suggested change

	workflow = self.repo.get_workflow(self.workflow_file)
	workflow = await asyncio.to_thread(self.repo.get_workflow, self.workflow_file)