Fix macOS CI: correct Developer ID cert and signing identity

- Export correct Developer ID Application cert (was wrong cert entirely -
  push notification cert for different app)
- Use single APPLE_DEVID_P12 secret (3KB fits without splitting)
- Fix signing_identity to match actual cert name in keychain

Author: proggeramlug

.github/workflows/release.yml

@@ -42,13 +42,8 @@ jobs:
         run: |
           echo "${{ secrets.APPLE_APPSTORE_P12 }}" | base64 -d > /tmp/macos_appstore.p12
           echo "${{ secrets.APPLE_INSTALLER_P12 }}" | base64 -d > /tmp/macos_installer.p12
-          printf '%s' "$DEVID_PART1" "$DEVID_PART2" | base64 -d > /tmp/macos_devid.p12
-          echo "DevID p12 size: $(wc -c < /tmp/macos_devid.p12) bytes (expected ~43839)"
+          echo "${{ secrets.APPLE_DEVID_P12 }}" | base64 -d > /tmp/macos_devid.p12
           echo "${{ secrets.APPLE_P8_KEY }}" | base64 -d > /tmp/appstore_connect.p8
-        env:
-          DEVID_PART1: ${{ secrets.APPLE_DEVID_P12_PART1 }}
-          DEVID_PART2: ${{ secrets.APPLE_DEVID_P12_PART2 }}
-
       - name: Inject credential paths into perry.toml
         run: |
           sed -i '/^\[macos\]/a certificate = "/tmp/macos_appstore.p12"' perry.toml