contrib/docker: Ensure correct encoding and locale settings on DB creation

[fridtjof]

According to the docs, these should be explicitly set. In my case, after setting up a homeserver with this compose file as a reference, I ended up with this:

synapse=# SELECT datcollate,datctype FROM pg_database WHERE datname = current_database();
 datcollate |  datctype  
------------+------------
 en_US.utf8 | en_US.utf8

Signed-off-by: Fridtjof Mund fridtjof@das-labor.org

[richvdh]

looks sensible. Thanks!

[fridtjof]

So, after using this today, I noticed that docker-compose (in combination with the entrypoint postgres uses in that container) really does not like the quotes I used:

The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.utf8".
initdb: "UTF-8 --lc-collate=C --lc-ctype=C" is not a valid server encoding name

After removing the quotes, it behaved:

The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locales
  COLLATE:  C
  CTYPE:    C
  MESSAGES: en_US.utf8
  MONETARY: en_US.utf8
  NUMERIC:  en_US.utf8
  TIME:     en_US.utf8
The default text search configuration will be set to "english".

[...]

I'll open another PR shortly 🤦‍♂