fix reader role arn

Author: abarciauskas-bgse

.github/actions/cdk-deploy/action.yml

@@ -77,7 +77,7 @@ runs:
       run: uv run cdk deploy --all --require-approval never --outputs-file ${HOME}/cdk-outputs.json
       shell: bash
       env:
-        TITILER_CMR_ROLE_ARN: $TITILER_CMR_READER_ROLE_ARN
+        TITILER_CMR_ROLE_ARN: ${{ env.TITILER_CMR_READER_ROLE_ARN }}
         TITILER_CMR_STAGE: test
         # TODO: are these being used?
         TITILER_CMR_ADDITIONAL_ENV: '{"TITILER_CMR_S3_AUTH_STRATEGY":"iam", "TITILER_CMR_API_DEBUG":"TRUE"}'