Livy and docker compose

[warichet]

Hello,
i try to adapt "docker-compose.spark_bitnami.yml" to used it with an existing installation of spark on docker (also an bitnami container).
I have an error about SPARK_HOME variable corrected in docker compose.
If i have understood this variable is used to get configuration of spark.
Is it possible to have only spark configuration in dockerfile instead to have a full spark installation ?

Thanks for your work.
Best regards
Seb

docker compose file:
services:
spark:
build: .
environment:
- SPARK_MODE=master
......
spark-worker-1:
build: .
environment:
- SPARK_MODE=worker
.....
livy:
image: livy-ofekhod
container_name: livy
environment:
- SPARK_HOME=/opt/bitnami/spark
- SPARK_CONF_DIR=/opt/bitnami/spark/conf
......