Update pull_request.yml

Author: Stefterv

.github/workflows/pull_request.yml

@@ -54,6 +54,8 @@ jobs:
         uses: cedx/setup-ant@v3
       - name: Build Release
         run: ant -noinput -buildfile build/build.xml ${{ matrix.os_prefix }}-dist -Dversion="${{ github.sha }}
+        env:
+          PROCESSING_APP_SIGNING: false 
       - name: Add artifact
         uses: actions/upload-artifact@v3
         id: upload