Use npm-run-all for danger:prepush to run scripts in sequence

Author: glensc

package.json

@@ -71,7 +71,8 @@
     "docs:cp_defs": "mkdir docs/docs_generate; cp source/danger.d.ts docs/docs_generate; cp node_modules/@octokit/rest/index.d.ts docs/docs_generate/github.d.ts",
     "docs": "yarn run docs:cp_defs; yarn typedoc --ignoreCompilerErrors --mode modules --json docs/js_ref_dsl_docs.json --includeDeclarations source",
     "dts-lint": "yarn run declarations && yarn dtslint types",
-    "danger:prepush": "yarn build:fast; yarn test:fixtures; node distribution/commands/danger.js local --base main --dangerfile dangerfile.lite.ts"
+    "danger:local": "node distribution/commands/danger.js local --base main --dangerfile dangerfile.lite.ts",
+    "danger:prepush": "npm-run-all build:fast test:fixtures danger:local"
   },
   "repository": {
     "type": "git",
@@ -133,6 +134,7 @@
     "lint-staged": "^7.3.0",
     "madge": "^3.2.0",
     "nock": "^10.0.6",
+    "npm-run-all": "^4.1.5",
     "pkg": "^4.4.2",
     "prettier": "^2.5.1",
     "release-it": "^13.5.2",