message: Added docs for knex pool config
diff: @@ -55,3 +55,35 @@ launching Backstage, or remove the `${...}` values and simply set actual values
  directly for development.
  The Backstage App is now ready to start up with a PostgreSQL backing database.
  +
  +### Override default PostgreSQL Database Pool Configuration
  +
  +If you want to override the default connection pool settings then use the below configuration:
  +
  +```diff
  +backend:
  + database:
  +- client: better-sqlite3
  +- connection: ':memory:'
  ++ # config options: https://node-postgres.com/api/client
  ++ client: pg
  ++ connection:
  ++ host: ${POSTGRES_HOST}
  ++ port: ${POSTGRES_PORT}
  ++ user: ${POSTGRES_USER}
  ++ password: ${POSTGRES_PASSWORD}
  ++ # Refer to Tarn docs for default values on PostgreSQL pool configuration - https://github.com/Vincit/tarn.js
  ++ knexConfig:
  ++ pool:
  ++ min: 3
  ++ max: 12
  ++ acquireTimeoutMillis: 60000
  ++ idleTimeoutMillis: 60000
  ++ # https://node-postgres.com/features/ssl
  ++ # you can set the sslmode configuration option via the `PGSSLMODE` environment variable
  ++ # see https://www.postgresql.org/docs/current/libpq-ssl.html Table 33.1. SSL Mode Descriptions (e.g. require)
  ++ # ssl:
  ++ # ca: # if you have a CA file and want to verify it you can uncomment this section
  ++ # $file: <file-path>/ca/server.crt
  +```
  +
  