feat: Convert migration files to JS

packages/backend/src/db/migrations/20220219100800_create_execution_steps.js

@@ -0,0 +1,16 @@
+export async function up(knex) {
+  return knex.schema.createTable('execution_steps', (table) => {
+    table.uuid('id').primary().defaultTo(knex.raw('gen_random_uuid()'));
+    table.uuid('execution_id').references('id').inTable('executions');
+    table.uuid('step_id').references('id').inTable('steps');
+    table.string('status');
+    table.text('data_in');
+    table.text('data_out');
+
+    table.timestamps(true, true);
+  });
+}
+
+export async function down(knex) {
+  return knex.schema.dropTable('execution_steps');
+}