Update pod version after release (#1338)

Summary:
This diff updates the Github workflow to update pod versions after the release is published on Cocoapods.
## Changelog

- Update Github workflow to update the pod versions till the release is published in Cocoapods.

Pull Request resolved: https://github.com/facebook/flipper/pull/1338

Test Plan:
A PR got created with the updated pod versions after the release was pushed.
https://github.com/facebook/flipper/pull/1365

Reviewed By: passy

Differential Revision: D22456857

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 335996bc1ebb6da309d3f60a8f3401559e0a83c7

scripts/update-pod-versions.sh

@@ -0,0 +1,46 @@
+#!/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.
+
+set -e
+if [ -z "$1" ]
+  then
+    echo "Please pass the root directory of flipper repository as a first argument."
+    exit 1
+fi
+
+if [ -z "$2" ]
+  then
+    echo "Please pass the path to update the pod version in your second argument."
+    exit 1
+fi
+
+darwin=false
+case "$(uname)" in
+  Darwin*) darwin=true ;;
+esac
+
+if ! jq --version > /dev/null; then
+  if $darwin; then
+    echo "jq is not installed. Installing it..."
+    brew install jq
+  else
+    echo >&2 "jq is not installed. Please install it using your platform's package manager (apt-get, yum, pacman, etc.)."
+    exit 1
+  fi
+fi
+
+FLIPPER_DIR=$1
+PACKAGE_VERSION=$(jq -r .version "$FLIPPER_DIR/desktop/package.json")
+OLD_VERSION_POD_ARG=$(< "FlipperKit.podspec" grep "flipperkit_version =" )
+OLD_VERSION="${OLD_VERSION_POD_ARG##* }"
+FLIPPERKIT_VERSION_TAG='flipperkit_version'
+
+echo "Updating $2"
+if $darwin; then
+sed -i '' "s/${FLIPPERKIT_VERSION_TAG} = ${OLD_VERSION}/${FLIPPERKIT_VERSION_TAG} = '${PACKAGE_VERSION}'/" "$2"
+else
+  sed -i "s/${FLIPPERKIT_VERSION_TAG} = ${OLD_VERSION}/${FLIPPERKIT_VERSION_TAG} = '${PACKAGE_VERSION}'/" "$2"
+fi