pem used by letsencrypt

src/freedombone

     echo "ROOT_URL = http://$GIT_DOMAIN_NAME/" >> $GOGS_CONFIG_FILE
     echo "SSH_PORT = $SSH_PORT" >> $GOGS_CONFIG_FILE
     echo 'SSH_DOMAIN = %(DOMAIN)s' >> $GOGS_CONFIG_FILE
-    echo "CERT_FILE = /etc/ssl/certs/${GIT_DOMAIN_NAME}.crt" >> $GOGS_CONFIG_FILE
+    echo "CERT_FILE = /etc/ssl/certs/${GIT_DOMAIN_NAME}.pem" >> $GOGS_CONFIG_FILE
     echo "KEY_FILE = /etc/ssl/private/${GIT_DOMAIN_NAME}.key" >> $GOGS_CONFIG_FILE
     echo 'DISABLE_ROUTER_LOG = true' >> $GOGS_CONFIG_FILE
     echo '' >> $GOGS_CONFIG_FILE