Fix quickstart doc with docker compose

Author: MonkeyCanCode

getting-started/assets/.env renamed to getting-started/assets/env

@@ -38,7 +38,7 @@ This example requires `jq` to be installed on your machine.
 
     ```shell
     export ASSETS_PATH=$(pwd)/getting-started/assets/
-    docker compose --env-file getting-started/assets/.env -f getting-started/assets/postgres/docker-compose-postgres.yml -f getting-started/eclipselink/docker-compose-bootstrap-db.yml -f getting-started/eclipselink/docker-compose.yml up
+    docker compose --env-file getting-started/assets/env -f getting-started/assets/postgres/docker-compose-postgres.yml -f getting-started/eclipselink/docker-compose-bootstrap-db.yml -f getting-started/eclipselink/docker-compose.yml up
     ```
 
 3. Using spark-sql: attach to the running spark-sql container:

getting-started/eclipselink/README.md

@@ -37,7 +37,7 @@ cd ~/polaris
   -Dquarkus.container-image.tag=postgres-latest \
   -Dquarkus.container-image.build=true
 export ASSETS_PATH=$(pwd)/getting-started/assets/
-docker compose --env-file getting-started/assets/.env -f getting-started/assets/postgres/docker-compose-postgres.yml -f getting-started/eclipselink/docker-compose-bootstrap-db.yml -f getting-started/eclipselink/docker-compose.yml up
+docker compose --env-file getting-started/assets/env -f getting-started/assets/postgres/docker-compose-postgres.yml -f getting-started/eclipselink/docker-compose-bootstrap-db.yml -f getting-started/eclipselink/docker-compose.yml up
 ```
 
 You should see output for some time as Polaris, Spark, and Trino build and start up. Eventually, you won’t see any more logs and see some logs relating to Spark, resembling the following: