Using deprecated ENV syntax

https://github.com/mealie-recipes/mealie/blob/040ec56c186384c3b9d0f3eba3afc90e2513d926/docker/Dockerfile#L156

ENV HOST 0.0.0.0 should be ENV HOST=0.0.0.0.

It also looks like the paths are wrong for copying the .sh scripts:

COPY ./docker/entry.sh $MEALIE_HOME/run.sh

The build file runs from the docker dir.