Unable to pull the latest stable channel update

Hello,

I've tried to update my instance today with the stable channel. 2.2.1 looks be merged to it now, yet when I pull the source using `docker-compose pull`, then `docker build -t pleroma .` it just gives me 2.2.0.

I noted that it does mention that web needs to be built with `docker-compose build web` but I though the `docker build -t pleroma .` would cover that.

After the build I get `Successfully built 4356aa2a5f15`