fix: connect admin user with admin role

(bug from 3.13.0)

src/migrations/20210428103924-patch-admin_role.js

@@ -0,0 +1,27 @@
+'use strict';
+
+exports.up = function (db, cb) {
+    db.runSql(
+        `
+        DO $$
+        declare
+        begin
+                WITH admin AS (
+                    SELECT * FROM roles WHERE name in ('Admin', 'Super User') LIMIT 1
+                )
+                INSERT into role_user(role_id, user_id)
+                VALUES 
+                    ((select id from admin), (select id FROM users where username='admin' LIMIT 1)); 
+
+        EXCEPTION WHEN OTHERS THEN
+            raise notice 'Ignored';
+        end;
+        $$;`,
+        cb,
+    );
+};
+
+exports.down = function (db, cb) {
+    // We can't just remove roles for users as we don't know if there has been any manual additions.
+    cb();
+};