Fix working directory for deploying iOS alpha versions (#708)

Fixes:
https://github.com/SharezoneApp/sharezone-app/actions/runs/5776636318/job/15655975288

.github/workflows/alpha.yml

@@ -208,16 +208,14 @@ jobs:
   deploy-alpha-ios-app:
     runs-on: macos-13
     timeout-minutes: 120
-    defaults:
-      run:
-        working-directory: app
     steps:
     - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
 
     - name: Install Codemagic CLI Tools
       run: pip3 install codemagic-cli-tools==0.39.1
 
     - name: Setup signing
+      working-directory: app
       env:
         # The following secrets are used by the Codemagic CLI tool. It's important
         # to use the same names as the CLI tool expects.