try fix the concurrency problem

.github/workflows/deploy.yaml

@@ -58,6 +58,17 @@ jobs:
           npx cdk deploy --ci --all --require-approval never
           deactivate
           cd -
+
+      - name: Release synth lock
+        if: always()
+        run: |
+          # see https://github.com/aws/aws-cdk/issues/24946
+
+          if [-d "integration_tests/cdk/cdk.out"]; then
+            ls -la integration_tests/cdk/cdk.out
+            rm -f integration_tests/cdk/cdk.out/synth.lock
+          fi
+
           
       - name: Tear down any infrastructure
         if: always()
@@ -68,8 +79,5 @@ jobs:
             cd -
             source .deployment_venv/bin/activate
             cd integration_tests/cdk
-            # see https://github.com/aws/aws-cdk/issues/24946
-            # this didn't work : rm -f cdk.out/synth.lock
-            # so we just duplicate the cdk output to cdk-destroy.out
-            npx cdk destroy --output cdk-destroy.out --ci --all --force
+            npx cdk destroy --ci --all --force
           fi