chore: enable atmosphere (#316)

Once this is merged we can increase concurrency. 

---
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under the terms of the Apache-2.0 license

Author: iliapolo

.github/workflows/integ.yml

@@ -1538,6 +1538,11 @@ new CdkCliIntegTestsWorkflow(repo, {
     // - Previously released version for aws-cdk-lib
     cloudAssemblySchema.name,
   ],
+  enableAtmosphere: {
+    oidcRoleArn: '${{ vars.CDK_ATMOSPHERE_PROD_OIDC_ROLE }}',
+    endpoint: '${{ vars.CDK_ATMOSPHERE_PROD_ENDPOINT }}',
+    pool: '${{ vars.CDK_INTEG_ATMOSPHERE_POOL }}',
+  },
 });
 
 new CodeCovWorkflow(repo, {