Fixes failing docker issue (opensearch-project#733)

Signed-off-by: Gagan Juneja <[email protected]>
Co-authored-by: Gagan Juneja <[email protected]>

.github/workflows/gradle.yml

@@ -31,7 +31,7 @@ jobs:
       # Explicitly set the docker-compose program path so that our build scripts in RCA can run the program
       # This is necessary because of the Github Actions environment and the workingDir of the Gradle environment
     - name: Set docker-compose path
-      run: DOCKER_COMPOSE_LOCATION=$(which docker-compose)
+      run: echo "DOCKER_COMPOSE_LOCATION=$(which docker-compose)" >> $GITHUB_ENV
       # Set the vm.max_map_count system property to the minimum required to run OpenSearch
     - name: Set vm.max_map_count
       run: sudo sysctl -w vm.max_map_count=262144