OSS: update Podfile.lock automatically when bumping release version

Summary:
To ensure consistency of RNTester Podfile.lock:
* introduce a script to run `pod install` on the current commit
* have the script check the exact CocoaPods version to use for consistency
* have version bump script run this automatically to keep it up-to-date with the version change

To validate, have this change in `0.66-stable` branch, then try:

```
./scripts/bump-oss-version.js 0.66.0-rc.5
```

This automatically ran `pod install` which produced the Podfile.lock update.

Changelog: [Internal]

Reviewed By: TheSavior

Differential Revision: D31132867

fbshipit-source-id: 1c82653ca0cfc5471ed2c5091c09648a7acbab90

Author: fkgozali

scripts/bump-oss-version.js

@@ -32,6 +32,8 @@ let argv = yargs
   }).argv;
 
 const nightlyBuild = argv.nightly;
+// Nightly builds don't need an update as main will already be up-to-date.
+const updatePodfileLock = !nightlyBuild;
 
 let version, branch;
 if (nightlyBuild) {
@@ -152,6 +154,15 @@ if (
 // Change react-native version in the template's package.json
 exec(`node scripts/set-rn-template-version.js ${version}`);
 
+if (updatePodfileLock) {
+  echo('Updating RNTester Podfile.lock...')
+  if (exec('source scripts/update_podfile_lock.sh && update_pods').code) {
+    echo('Failed to update RNTester Podfile.lock.');
+    echo('Fix the issue, revert and try again.');
+    exit(1);
+  }
+}
+
 // Verify that files changed, we just do a git diff and check how many times version is added across files
 let numberOfChangedLinesWithNewVersion = exec(
   `git diff -U0 | grep '^[+]' | grep -c ${version} `,

scripts/update_podfile_lock.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# This script updates RNTester Podfile.lock after verifying the CocoaPods environment.
+# Usage:
+#   source scripts/update_podfile_lock && update_pods
+
+THIS_DIR=$(cd -P "$(dirname "$(readlink "${BASH_SOURCE[0]}" || echo "${BASH_SOURCE[0]}")")" && pwd)
+RNTESTER_DIR="$THIS_DIR/../packages/rn-tester"
+
+# Note: Keep in sync with FB internal.
+REQUIRED_COCOAPODS_VERSION="1.10.1"
+
+validate_env () {
+  # Check that CocoaPods is working.
+  if [ -z "$(command -v pod)" ]; then
+    echo "You need to install CocoaPods."
+    echo "See https://guides.cocoapods.org/using/getting-started.html#getting-started for instructions."
+    exit 1
+  fi
+
+  COCOAPODS_VERSION=$(pod --version)
+  if [[ "$COCOAPODS_VERSION" != "$REQUIRED_COCOAPODS_VERSION" ]];
+  then
+    echo "You must have CocoaPods $REQUIRED_COCOAPODS_VERSION installed; you have $COCOAPODS_VERSION."
+    echo "Installing via gem is recommended:"
+    echo "  sudo gem install cocoapods -v $REQUIRED_COCOAPODS_VERSION"
+    exit 1
+  fi
+}
+
+update_pods () {
+  validate_env
+
+  cd "$RNTESTER_DIR" || exit
+  pod install
+  cd "$THIS_DIR" || exit
+}