Update the following database variables as relevant to your Postgres container:
+DB_HOSTNAME
DB_USERNAME
DB_PASSWORD
DB_DATABASE_NAME
DB_PORT
If you are using the Docker Folders plugin go the Docker tab and select "New Folder".
Label it "Immich" and use the logo from the Immich homepage (right click the logo, "Save As", and reupload to Unraid)
Then simply select all the Immich related containers before clicking "Submit"