revert: Allow postgres connections that require ssl mode (#408)

This reverts commit eea57ff121.

server/.env.sample

@@ -9,11 +9,6 @@ SECRET_KEY=notsecretkey
 # TRUST_PROXY=0
 # TOKEN_EXPIRES_IN=365 # In days
 
-# related: https://github.com/knex/knex/issues/2354
-# As knex does not pass query parameters from the connection string we
-# have to use environment variables in order to pass the desired values, e.g.
-# PGSSLMODE=<value>
-
 ## Do not edit this
 
 TZ=UTC

server/db/knexfile.js

@@ -8,12 +8,7 @@ dotenv.config({
 
 module.exports = {
   client: 'pg',
-  connection: {
-    connectionString: process.env.DATABASE_URL,
-    ssl: {
-      rejectUnauthorized: false,
-    },
-  },
+  connection: process.env.DATABASE_URL,
   migrations: {
     tableName: 'migration',
     directory: path.join(__dirname, 'migrations'),