Add support locale and template

[ftx-coder]

Hello everyone,

I would like to create a database that support template and locale out of the box without customizing the Dockerfile. Is there any environment variable that I can use to pass the locale and template?

createdb oak -l C -T template0

https://www.postgresql.org/docs/12/sql-createdatabase.html

Thanks

[mscherer]

I am also looking at that, for installing synapse on openshift. Right now, it fail with:

sh-5.1# /srv/start.sh 
/usr/lib/python3.9/site-packages/twisted/conch/ssh/common.py:14: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
  from cryptography.utils import int_from_bytes, int_to_bytes
Redirected stdout/stderr to logs
***** STARTING SERVER *****
Server /usr/lib/python3.9/site-packages/synapse/app/homeserver.py version 1.26.0
Server hostname: example.org
Instance name: master
Setting up server
Setting up.
[database config 'master']: Checking database server
Database has incorrect collation of 'en_US.utf8'. Should be 'C'
See docs/postgres.md for more information.
Database has incorrect ctype of 'en_US.utf8'. Should be 'C'
See docs/postgres.md for more information.
[database config 'master']: Preparing for databases ['main', 'state']
['main', 'state']: Checking existing schema version
['main', 'state']: Initialising new database
*******************************************************
 Database is incorrectly configured:
 
     - 'COLLATE' is set to 'en_US.utf8'. Should be 'C'
     - 'CTYPE' is set to 'en_US.utf8'. Should be 'C'
 
 See docs/postgres.md for more information.
*******************************************************

Referring to that doc.