OZ-776: Update Docker compose demo service to Docker internal URL for Keycloak

Author: kipchubett

docker-compose-demo.yml

@@ -9,7 +9,7 @@ services:
       - OPENMRS_OAUTH_ENABLED=${ENABLE_SSO}
       - OPENMRS_OAUTH_CLIENT_ID=${OAUTH_CLIENT_ID}
       - OPENMRS_OAUTH_CLIENT_SECRET=${OAUTH_CLIENT_SECRET}
-      - KEYCLOAK_SERVER_URL=${SERVER_SCHEME}://${KEYCLOAK_HOSTNAME}
+      - KEYCLOAK_SERVER_URL=${KEYCLOAK_INTERNAL_HOST_URL}
       - KEYCLOAK_DEMO_DATA_REALM=ozone
       - KEYCLOAK_USERS_JSON_PATH=/app/keycloak/users.json
       - KEYCLOAK_USER_CREATION_ENABLED=${ENABLE_SSO}