Manage in-memory volume by scripting

[jcpitre]

Using the in-memory file system was introduced in #1320 (I think). At the time there was no way to configure the file system using terraform.

We should:

• See if terraform now supports this OR
• Use a script to create the manage the in-memory file system.

If we need to use a script, see if it can be integrated with the terraform config (e.g. run a script systematically after terraform finishes).

As an example, here is a tested script that creates and mounts an in-memory file system:

  info "Adding in-memory volume to Cloud Run service..."
  gcloud run services update "${FUNCTION_NAME}" \
    --project "${PROJECT}" \
    --region "${REGION}" \
    --add-volume name=in-memory,type=in-memory,size-limit=1Gi \
    --add-volume-mount volume=in-memory,mount-path=/tmp/in-memory \
    --quiet