Adding a repository dispatch event to apollo repository for docker build.

Issue

Whenever changes are pushed to the main branch of the docs repo, we need to rebuild the docker image (for the apollo repo) in order to seed the database with the updated docs. This issue needs to be looked into after PR is merged.

Implementation

To achieve this, we can add a step to the already existing workflow to trigger a dispatch event for the apollo repo to re-build the docker image.

We can either do it using the peter-evans/repository-dispatch@v2 or a

curl -X POST -H "Accept: application/vnd.github.v3+json" \
          -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
          https://api.github.com/repos/OpenFn/apollo/dispatches \
          -d '{"event_type":"docs-updated"}

First confirm that OpenFn/apollo#86 has been merged, then inspect the existing workflow in the docs repository. Determine how it can send a repository dispatch event to OpenFn/apollo using the proposed action or API request, and verify that a docs update results in the expected Docker rebuild and database seed.