Remove postinstall script

.ado/publish.yml

@@ -107,7 +107,7 @@ jobs:
   - job: RNMacOSInitNpmJSPublish
     displayName: react-native-macos-init Publish to npmjs.org
     pool:
-      vmImage: vs2017-win2016
+      vmImage: ubuntu-latest
     timeoutInMinutes: 90 # how long to run the job before automatically cancelling
     cancelTimeoutInMinutes: 5 # how much time to give 'run always even if cancelled tasks' before killing them
     condition: eq(variables['Build.SourceBranchName'], 'master')
@@ -144,7 +144,7 @@ jobs:
   - job: RNGithubOfficePublish
     displayName: React-Native GitHub Publish to Office
     pool:
-      vmImage: ubuntu-18.04
+      vmImage: ubuntu-latest
     timeoutInMinutes: 90 # how long to run the job before automatically cancelling
     cancelTimeoutInMinutes: 5 # how much time to give 'run always even if cancelled tasks' before killing them
     steps:

package.json

@@ -46,7 +46,6 @@
     "scripts/launchPackager.command",
     "scripts/node-binary.sh",
     "scripts/packager.sh",
-    "scripts/postInstall.js",
     "scripts/react_native_pods.rb",
     "scripts/react-native-xcode.sh",
     "template.config.js",
@@ -81,8 +80,7 @@
     "test-android-e2e": "yarn run docker-build-android && yarn run test-android-run-e2e",
     "build-ios-e2e": "detox build -c ios.sim.release",
     "test-ios-e2e": "detox test -c ios.sim.release packages/rn-tester/e2e",
-    "test-ios": "./scripts/objc-test.sh test",
-    "postinstall": "node scripts/postInstall.js"
+    "test-ios": "./scripts/objc-test.sh test"
   },
   "workspaces": [
     "packages/!(eslint-config-react-native-community)",