[Docs] Changelog action

[luarss]

Some things to note:

• We need to set the changelog action to trigger on push once for it to be recorded. Thereafter, we can comment out the push action and only do manual trigger. This can help reduce generating too many PRs. 1
• For the PR template, the changes will only be visible once it is merged into main and must be a file named pull_request_template.md. 2

The template we are for PR categorisation are as follows:

@vvbandeira @dralabeing

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[dralabeing]

@vvbandeira Can we finalize this template for changelog? LGTM

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[github-actions[bot]]

clang-tidy review says "All clean, LGTM! :+1:"

[luarss]

@vvbandeira Do we have (permissions contents: write and pull-requests: write) enabled for secrets.GITHUB_TOKEN?