Fixed Docker regarding no size window with gocui

- Runs the container with `/bin/sh` initially
- Invoke `lazydocker` from within the container, or gocui fails as the terminal window is invalid at launch

Dockerfile

@@ -24,6 +24,5 @@ LABEL org.label-schema.schema-version="1.0.0-rc1" \
     org.label-schema.vcs-description="The lazier way to manage everything docker" \
     org.label-schema.docker.cmd="docker run -it -v /var/run/docker.sock:/var/run/docker.sock lazydocker" \
     org.label-schema.version=${VERSION}
-RUN apk --update add -q --progress --no-cache -U git xdg-utils
-ENTRYPOINT [ "lazydocker" ]
+ENTRYPOINT [ "/bin/sh" ]
 COPY --from=builder /go/src/github.com/jesseduffield/lazydocker/lazydocker /usr/bin/lazydocker

README.md

@@ -97,6 +97,8 @@ go get github.com/jesseduffield/lazydocker
     docker run -it -v /var/run/docker.sock:/var/run/docker.sock lazydocker
     ```
 
+1. Then enter `lazydocker`
+
 ## Usage
 
 Call `lazydocker` in your terminal. I personally use this a lot so I've made an alias for it like so: