Upgrade Ghost 4 to Ghost 5 continuing to use sqlite

Works!!

Removed the service with docker compose down ghost-blog.

Changed image: ghost:4-alpine to image: ghost:5-alpine and added

[..]
    environment:
[..]
      - database__client=sqlite3
      - database__connection__filename="content/data/ghost.db"
      - database__useNullAsDefault=true
      - database__debug=false

in the docker compose file. The parameters are sourced from here.

Pull the new image and recreate the service with the new config

docker pull ghost:alpine-5
docker compose up ghost-blog -d