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feat: let renovate pin version of postgres used in CI and local dev

Dr Rich Warehamrequested to merge
issue-117-pin-postgres into master

Add a POSTGRES_DOCKER_IMAGE variable which is used to specify the postgres image to use in CI for running tests. This variable will be respected both by CI jobs which spin up a GitLab CI service and pytest spinning up its own container.

Teach renovate how to update this image.

For local development, specify the version of the postgres image to be used. This then becomes visible to renovate for update.

Renovate recognises that the same postgres dependency is used and so will naturally group updating POSTGRES_DOCKER_IMAGE and the use of image: postgres:... in the docker-compose.yml file together.

The renovate configuration was tested locally in a testing branch of the ballots webapp.

We cannot yet get renovate to simultaneously update the postgres version used when the application is deployed and so add a comment which we hope, probably in vain, people will read in renovate-opened MRs :).

Closes #117 (closed)

Edited by Dr Rich Wareham

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