feat: export window.GIT_COMMIT_HASH (#6080)

src/pages/App.tsx

@@ -63,6 +63,10 @@ const AMPLITUDE_PROXY_URL = process.env.REACT_APP_AMPLITUDE_PROXY_URL
 const STATSIG_DUMMY_KEY = 'client-0000000000000000000000000000000000000000000'
 const STATSIG_PROXY_URL = process.env.REACT_APP_STATSIG_PROXY_URL
 const COMMIT_HASH = process.env.REACT_APP_GIT_COMMIT_HASH
+
+// Dump some metadata into the window to allow client verification.
+window.GIT_COMMIT_HASH = COMMIT_HASH
+
 initializeAnalytics(AMPLITUDE_DUMMY_KEY, OriginApplication.INTERFACE, {
   proxyUrl: AMPLITUDE_PROXY_URL,
   defaultEventName: SharedEventName.PAGE_VIEWED,

src/react-app-env.d.ts

@@ -5,6 +5,8 @@ declare module '@metamask/jazzicon' {
 }
 
 interface Window {
+  GIT_COMMIT_HASH?: string
+
   // walletLinkExtension is injected by the Coinbase Wallet extension
   walletLinkExtension?: any
   ethereum?: {