Update .github/workflows/mac-dmg-x64.yml

Co-authored-by: Sebastian Stenzel <overheadhunter@users.noreply.github.com>

.github/workflows/mac-dmg-x64.yml

@@ -152,8 +152,9 @@ jobs:
           REVISION_NO: ${{ needs.get-version.outputs.revNum }}
           PROVISIONING_PROFILE_BASE64: ${{ secrets.MACOS_PROVISIONING_PROFILE_BASE64 }}
       - name: Build and install DockTilePlugin
+        env:
+          DERIVED_DATA_PATH: dist/mac/DockTilePlugin/build
         run: |
-          DERIVED_DATA_PATH=dist/mac/DockTilePlugin/build
           xcodebuild -project dist/mac/DockTilePlugin/DockTilePlugin.xcodeproj \
                      -scheme DockTilePlugin \
                      -configuration Release \