Data-sources provision - Can't fill password in Postgres using docker

I’m trying to initlizze Grafna using docker (setup the Grfana container using docker-compose.yml). On of my datasources is Postgresql.
I’m trying to set up with provisioning/datasources/postgres.yml:

deleteDatasources:
  - name: 'PostgreSQL'
    org_id: 1

datasources:
- name: 'PostgreSQL'
  type: 'postgres'
  url: myserver.database.azure.com:5432
  user: foo@myserver
  editable: true
  org_id: 1
  is_default: true
  database: foo
  secureJsonData:
    password: 'password7890!'
  jsonData:
    sslmode: 'disable'
    postgres_version: 1100
    timescaledb: true

For some reason the password field isn’t filled.
Do you have idea why it happens and how can I fix it?

related: see this new GH issue: