Use mysql to match our installation

.envrc.sample

@@ -1,14 +1,14 @@
 export APP_INI_VERSION=v1
 export APP_NAME=gitea
-export DB_HOST=postgres:5432
+export DB_HOST=mariadb:3306
 export DB_NAME=gitea
 export DB_PASSWD_VERSION=v1
-export DB_TYPE=postgres
+export DB_TYPE=mysql
 export DB_USER=gitea
 export DOMAIN=gitea.swarm.autonomic.zone
 export INTERNAL_TOKEN_VERSION=v1
 export JWT_SECRET_VERSION=v1
-export LETS_ENCRYPT_ENV=staging
+export LETS_ENCRYPT_ENV=production
 export SECRET_KEY_VERSION=v1
 export SSH_HOST_PORT=2222
 export STACK_NAME=gitea