chore(integration-tests): Normalize DB config + use single process (#2077)

integration-tests/setup-env.js

@@ -0,0 +1,8 @@
+const path = require("path")
+
+require("dotenv").config({ path: path.join(__dirname, ".env.test") })
+
+if (typeof process.env.DB_TEMP_NAME === "undefined") {
+  const tempName = parseInt(process.env.JEST_WORKER_ID || "1")
+  process.env.DB_TEMP_NAME = `medusa-integration-${tempName}`
+}