Make this a bit simpler and document it

Author: ryanpeach

Dockerfile

@@ -201,5 +201,7 @@ ENV TERM=xterm-256color
 # Entrypoint must run as root to modify the user
 COPY entrypoint.sh /entrypoint.sh
 USER root
+WORKDIR /home/${USERNAME}/mnt
+ENV MNT=/home/${USERNAME}/mnt
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["/bin/zsh"]

Justfile

@@ -1,5 +1,5 @@
 build:
-    docker buildx build --progress=plain -t rgpeach10/shell:local . --load
+    docker buildx build --progress=plain -t rgpeach10/shell:local --no-cache . --load
 
 run-local:
     docker run -it --rm \

README.md

@@ -37,12 +37,9 @@ Create a `~/.docker-shell.sh` file with the following contents:
 #!/usr/bin/env bash
 
 docker run -it --rm \
-    -v $HOME/.ssh:/home/root/.ssh \
-    -v $HOME:/home/root/mnt \
+    -v $HOME:/home/rgpeach10/mnt \
     -v /var/run/docker.sock:/var/run/docker.sock \
-    -w /home/root/mnt \
     -e GITHUB_TOKEN=$(gh auth token) \
-    -e MNT=/home/rgpeach10/mnt \
     --pull=always \
     rgpeach10/shell:main
 ```

entrypoint.sh

@@ -3,7 +3,7 @@ set -e
 
 TARGET_UID=${TARGET_UID:-1000}
 TARGET_GID=${TARGET_GID:-1000}
-USERNAME=rgpeach10
+USERNAME=${USERNAME:-rgpeach10}
 
 CURRENT_UID=$(id -u "$USERNAME")
 CURRENT_GID=$(id -g "$USERNAME")