feat(ci): implement hybrid caching with Task fingerprinting

**Workflow Changes:**
- Add Task checksum cache for incremental build optimization
- Replace direct fastlane call with `task ios:testflight`
- Install go-task via homebrew in CI
- Cache Task's .task directory with source-based cache key

**Taskfile Enhancements:**
- Add fingerprinting to ios:testflight task
- Track sources: Rust code, Cargo files, tauri config, dist files, fastlane files
- Generate IPA artifacts as output markers
- Use checksum method for file change detection
- Add dependencies on npm:install and ios:init

**Benefits:**
- Task can skip builds when sources unchanged (even across CI runs)
- Centralized build logic (same commands locally and in CI)
- Reduced duplication between Actions cache and Task fingerprinting
- Better incremental build performance with cached checksums

Related: #optimization #taskfile #caching

Author: pythoninthegrass

.github/workflows/build-ios-app.yml

@@ -84,11 +84,19 @@ jobs:
         if: steps.cache-homebrew.outputs.cache-hit == 'true'
         run: brew link --overwrite xcodegen libimobiledevice 2>/dev/null || true
 
-      - name: Install npm dependencies
-        run: npm ci
+      - name: Cache Task checksums
+        uses: actions/cache@v5
+        with:
+          path: .task
+          key: ${{ runner.os }}-task-${{ hashFiles('Taskfile.yml', 'taskfiles/**/*.yml', 'src-tauri/**/*.rs', 'src-tauri/Cargo.toml', 'src-tauri/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-task-
+
+      - name: Install Task
+        uses: go-task/setup-task@v1
 
       - name: Build and upload to TestFlight
-        run: bundle exec fastlane beta
+        run: task ios:testflight
         env:
           AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

taskfiles/tauri.yml

@@ -268,6 +268,18 @@ tasks:
 
   ios:testflight:
     desc: "Build and upload to TestFlight"
+    deps: [":npm:install", "ios:init"]
+    sources:
+      - "{{.TAURI_DIR}}/src/**/*.rs"
+      - "{{.TAURI_DIR}}/Cargo.toml"
+      - "{{.TAURI_DIR}}/Cargo.lock"
+      - "{{.TAURI_DIR}}/tauri.conf.json"
+      - "{{.TAURI_DIR}}/dist/**/*"
+      - "{{.ROOT_DIR}}/fastlane/Fastfile"
+      - "{{.ROOT_DIR}}/fastlane/Appfile"
+    generates:
+      - "{{.TAURI_DIR}}/gen/apple/build/**/*.ipa"
+    method: checksum
     cmds:
       - fastlane beta