make MySQL SSL mode configurable via env var

Author: hosmelq

config/database.mysql.yml

@@ -5,6 +5,7 @@ default: &default
   username: <%= ENV.fetch("MYSQL_USER", "root") %>
   password: <%= ENV["MYSQL_PASSWORD"] %>
   pool: 50
+  ssl_mode: <%= ENV["MYSQL_SSL_MODE"] %>
   timeout: 5000
 
 development:
@@ -40,4 +41,4 @@ production:
   cache:
     <<: *default
     database: fizzy_production_cache
-    migrations_paths: db/cache_migrate
+    migrations_paths: db/cache_migrate