fix: database Compose warnings and set a project name

[rolodato]

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Changes

Fixes two warnings when launching the database from Docker Compose:

% docker --version
Docker version 26.0.0, build 2ae903e86c
% docker compose -f db.yml up
WARN[0000] /Users/rolodato/source/flagsmith/flagsmith/docker/db.yml: `version` is obsolete
[+] Running 1/1
 ✔ db Pulled                                                                                                   1.6s
WARN[0001] mount of type `volume` should not define `bind` option
[+] Running 0/1
 ⠋ Container docker-db-1  Created                                                                              0.0s
Attaching to db-1
[...]

Also, this PR adds a top-level name field to the Compose file. Otherwise, the default project name is docker (the directory name where the Compose file lives), which is not very informative.

Before:

After:

More details on the top-level version and name Compose field names: https://docs.docker.com/compose/compose-file/04-version-and-name/

How did you test this code?

Manually tested by starting the database using Compose as usual:

docker compose -f docker/db.yml up

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