feat(apple): Build GITHUB_SHA into Apple clients (#6406)

Closes #6401 

<img width="1012" alt="Screenshot 2024-08-21 at 11 52 31 PM"
src="https://github.com/user-attachments/assets/3012d088-97cb-4a82-8a8f-b2a398865755">

![Screenshot 2024-08-22 at 12 05
44 AM](https://github.com/user-attachments/assets/5e1209f9-e8fa-4453-9bdd-9f40339649b4)

.github/workflows/_swift.yml

@@ -113,6 +113,7 @@ jobs:
           if [ "${{ matrix.platform }}" = "iOS" ]; then
             # Build archive
             xcodebuild archive \
+              GIT_SHA=${GITHUB_SHA} \
               -skipMacroValidation \
               -archivePath $RUNNER_TEMP/Firezone.xcarchive \
               -configuration Release \
@@ -131,6 +132,7 @@ jobs:
           elif [ "${{ matrix.platform }}" = "macOS" ]; then
             # Build app bundle
             xcodebuild build \
+              GIT_SHA=${GITHUB_SHA} \
               -skipMacroValidation \
               -configuration Release \
               -scheme Firezone \

swift/apple/Firezone/Info.plist

@@ -19,5 +19,7 @@
 	<string>$(APP_GROUP_ID)</string>
   <key>ITSAppUsesNonExemptEncryption</key>
   <false/>
+  <key>GitSha</key>
+  <string>$(GIT_SHA)</string>
 </dict>
 </plist>

swift/apple/FirezoneKit/Sources/FirezoneKit/Helpers/AppInfoPlistConstants.swift

@@ -7,6 +7,14 @@
 import Foundation
 
 struct AppInfoPlistConstants {
+  static var gitSha: String {
+    guard let gitSha = Bundle.main.object(forInfoDictionaryKey: "GitSha") as? String,
+          !gitSha.isEmpty
+    else { return "unknown" }
+
+    return String(gitSha.prefix(8))
+  }
+
   static var appGroupId: String {
     guard let appGroupId = Bundle.main.object(forInfoDictionaryKey: "AppGroupIdentifier") as? String
     else {

swift/apple/FirezoneKit/Sources/FirezoneKit/Views/SettingsView.swift

@@ -365,6 +365,12 @@ public struct SettingsView: View {
           Spacer()
         }
         Spacer()
+        HStack {
+          Text("Build: \(AppInfoPlistConstants.gitSha)")
+            .textSelection(.enabled)
+            .foregroundColor(.gray)
+          Spacer()
+        }.padding([.leading, .bottom], 20)
       }
     #elseif os(iOS)
       VStack {
@@ -432,6 +438,13 @@ public struct SettingsView: View {
             footer: { Text(FootnoteText.forAdvanced) }
           )
         }
+        Spacer()
+        HStack {
+          Text("Build: \(AppInfoPlistConstants.gitSha)")
+            .textSelection(.enabled)
+            .foregroundColor(.gray)
+          Spacer()
+        }.padding([.leading, .bottom], 20)
       }
     #endif
   }

website/src/components/Changelog/Apple.tsx

@@ -9,6 +9,15 @@ export default function Apple() {
       href="https://apps.apple.com/us/app/firezone/id6443661826"
       title="macOS / iOS"
     >
+      {/*
+      <Entry version="1.2.1" date={new Date(todo)}>
+        <ul className="list-disc space-y-2 pl-4 mb-4">
+          <ChangeItem pull="6406">
+            Shows the Git SHA corresponding to the build on the Settings -> Advanced screen.
+          </ChangeItem>
+        </ul>
+      </Entry>
+      */}
       <Entry version="1.2.0" date={new Date("2024-08-21")}>
         <ul className="list-disc space-y-2 pl-4 mb-4">
           <ChangeItem pull="5901">