feat: create getConfig GQL query

packages/backend/src/graphql/queries/get-config.ts

@@ -0,0 +1,31 @@
+import Context from '../../types/express/context';
+import Config from '../../models/config';
+
+type Params = {
+  keys: string[];
+};
+
+const getConfig = async (
+  _parent: unknown,
+  params: Params,
+  context: Context
+) => {
+  const configQuery = Config
+    .query();
+
+  if (Array.isArray(params.keys)) {
+    configQuery.whereIn('key', params.keys);
+  }
+
+  const config = await configQuery;
+
+  return config.reduce((computedConfig, configEntry) => {
+    const { key, value } = configEntry;
+
+    computedConfig[key] = value?.data;
+
+    return computedConfig;
+  }, {} as Record<string, unknown>);
+};
+
+export default getConfig;