Pre-pull mongodb image in CI to use authenticated docker credentials

[rkistner]

#298 added "Docker login" to all CI actions, but unfortunately it did not take effect on the MongoDB images used by supercharge/mongodb-github-action. This resulted in frequent errors like these when running the actions:

  Unable to find image 'mongo:6.0' locally
  docker: Error response from daemon: toomanyrequests: You have reached your unauthenticated pull rate limit. https://www.docker.com/increase-rate-limit.

This adds a "pre-pull" before starting MongoDB, so that the image is already cached before starting it.

We can confirm it has an effect by looking at the runtime of the actions: Before it would take around 12s for "Start MongoDB". Now it takes around 9s for "Pre-pull Mongo image", and 3s for "Start MongoDB", confirming that it does use the cached image.

[changeset-bot]

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