Update build.yml

Author: Stefterv

.github/workflows/build.yml

@@ -67,15 +67,15 @@ jobs:
       - name: Setup Ant
         uses: cedx/setup-ant@v3
       - name: Install Certificates for Code Signing
-        if: ${{ matrix.os_prefix == 'macos' }}
+        if: ${{ matrix.os_prefix == 'macos' && startsWith(github.repository, 'processing/') }}
         uses: apple-actions/import-codesign-certs@v3
         with:
           p12-file-base64: ${{ secrets.CERTIFICATES_P12 }}
           p12-password: ${{ secrets.CERTIFICATES_P12_PASSWORD }}
       - name: Build Release
         run: ant -noinput -buildfile build/build.xml ${{ matrix.os_prefix }}-dist -Dversion="${{ github.sha }}"
         env:
-          PROCESSING_APP_SIGNING: true
+          PROCESSING_APP_SIGNING: ${{ startsWith(github.repository, 'processing/') }}
       - name: Add artifact
         uses: actions/upload-artifact@v4
         with: