Recent change to specify PostgreSQL v11 is effectively a downgrade, breaks existing deployments.

[nepella]

Before 9b4b400, docker-compose.yml specified an unversioned tag (alpine) for the PostgreSQL image. When I deployed Manifold v4.1.2 with it, postgres:alpine was equivalent to postgres:12-alpine. Commit 9b4b400, merged into v5.0.0, specified postgres:11-alpine, so upgrading to Manifold v5.0.0 effects a downgrade of the Postgres database, and Postgres refuses to work with the existing data. From the service logs:

PostgreSQL Database directory appears to contain a database; Skipping initialization
[1] FATAL:  database files are incompatible with server
[1] DETAIL:  The data directory was initialized by PostgreSQL version 12, which is not compatible with this version 11.8.

I solved this for myself by patching docker-compose.yml to reference postgres:12-alpine. Would that be acceptable?