Add sanity check Github Action for Executive Votes

[0xldr]

This GitHub Action automates the validation of markdown files within the governance/votes folder. It is triggered upon the creation of pull requests, ensuring adherence to predefined standards and structure. Key features include:

1. Automated Validation on Pull Requests:

   • The action is triggered whenever a pull request modifies markdown files in the governance/votes folder, ensuring that changes are reviewed for compliance with established standards.
   • It is able to validate multiple files, in the unlikely event that a Pull Request is editing multiple files within this folder.

2. Comprehensive Checks:

   • The action validates several aspects of the markdown files' metadata, including the presence of essential metadata fields such as title, summary, and date.
   • It verifies the format and checksum of Ethereum addresses for the address field, ensuring they are valid. An exception is made for the placeholder "$spell_address", which is recognized as a valid temporary placeholder.

3. Feedback via Comments:

   • If any issues are detected, the action posts a comment on the pull request, listing the specific validation errors for each file.
   • If no issues are found, it confirms successful validation, indicating that the markdown files meet the necessary criteria.

This is a fix for #2541

---

Examples

• PR with no issues: Clean test 0xldr/community#9
• PR with errors: Test with errors 0xldr/community#10

[MakerJanSky]

Thank you, ldr.