fix(ci): simplify Homebrew deps for self-hosted runner

Remove caching (packages persist between runs) and check before
installing to avoid 'already installed' warnings and gtar failures.

Author: pythoninthegrass

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

@@ -47,48 +47,11 @@ jobs:
           cache-targets: true
           cache-on-failure: true
 
-      - name: Set Homebrew prefix based on architecture
-        id: brew-prefix
+      - name: Ensure Tauri iOS dependencies
         run: |
-          if [[ $(uname -m) == "arm64" ]]; then
-            echo "prefix=/opt/homebrew" >> $GITHUB_OUTPUT
-          else
-            echo "prefix=/usr/local" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Get Homebrew formula versions
-        id: brew-versions
-        run: |
-          echo "xcodegen=$(brew info --json=v2 xcodegen | jq -r '.formulae[0].versions.stable')" >> $GITHUB_OUTPUT
-          echo "libimobiledevice=$(brew info --json=v2 libimobiledevice | jq -r '.formulae[0].versions.stable')" >> $GITHUB_OUTPUT
-
-      - name: Cache Homebrew packages
-        id: cache-homebrew
-        uses: actions/cache@v5
-        with:
-          path: |
-            ${{ steps.brew-prefix.outputs.prefix }}/Cellar/xcodegen
-            ${{ steps.brew-prefix.outputs.prefix }}/Cellar/libimobiledevice
-            ${{ steps.brew-prefix.outputs.prefix }}/Cellar/libplist
-            ${{ steps.brew-prefix.outputs.prefix }}/Cellar/libusbmuxd
-            ${{ steps.brew-prefix.outputs.prefix }}/opt/xcodegen
-            ${{ steps.brew-prefix.outputs.prefix }}/opt/libimobiledevice
-            ${{ steps.brew-prefix.outputs.prefix }}/opt/libplist
-            ${{ steps.brew-prefix.outputs.prefix }}/opt/libusbmuxd
-          key: ${{ runner.os }}-${{ runner.arch }}-brew-${{ steps.brew-versions.outputs.xcodegen }}-${{ steps.brew-versions.outputs.libimobiledevice }}
-          restore-keys: |
-            ${{ runner.os }}-${{ runner.arch }}-brew-
-
-      - name: Install Tauri iOS dependencies
-        if: steps.cache-homebrew.outputs.cache-hit != 'true'
-        run: |
-          brew install xcodegen libimobiledevice
-          # Ensure binaries are linked and in PATH for Tauri
-          brew link --overwrite xcodegen libimobiledevice 2>/dev/null || true
-
-      - name: Link cached Homebrew packages
-        if: steps.cache-homebrew.outputs.cache-hit == 'true'
-        run: brew link --overwrite xcodegen libimobiledevice 2>/dev/null || true
+          for pkg in xcodegen libimobiledevice; do
+            brew list "$pkg" &>/dev/null || brew install "$pkg"
+          done
 
       - name: Cache Task checksums
         uses: actions/cache@v5