I got an interpolation error when migrating from OpenProject v16 to OpenProject v17. I fixed it by simply adding a variable to the .env file, but I am curious about if others have faced a similar issue. 

When I run this command:

docker-compose -f docker-compose.yml -f docker-compose.control.yml build

I get this error:

invalid interpolation format for services.cron.environment.OPENPROJECT_COLLABORATIVE__EDITING__HOCUSPOCUS__URL.
You may need to escape any $ with another $.

The mentioned line in the docker-compose.yml file is:

OPENPROJECT_COLLABORATIVE__EDITING__HOCUSPOCUS__URL: "${COLLABORATIVE_SERVER_URL:-wss://${OPENPROJECT_HOST__NAME}/hocuspocus}"

What I did to workaround the issue?

Add the following lines to an .env file in the same folder of docker-compose.yml

COLLABORATIVE_SERVER_URL="wss://mydomain.com/hocuspocus"
OPENPROJECT_COLLABORATIVE__EDITING__HOCUSPOCUS__URL="wss://mydomain.com/hocuspocus"

I am running:

• Docker Compose version v2.12.2

• Docker version 25.0.14, build 0bab007

• Amazon Linux 2 on Amazon Lightsail

Any idea?

Thanks.