Migrate repositories from Buildkite to GitHub actions

[kenoir]

[!Note] See this Notion Epic.

Towards the goal of reducing infrastructure complexity and simplifying permissions we should migrate our projects from Buildkite to GitHub actions.

[kenoir]

For Q1 2024/25 we could aim to move:

• https://github.com/wellcomecollection/concepts-pipeline
• https://github.com/wellcomecollection/catalogue-pipeline