chore(devcontainer): move gyb env to Dockerfile

Author: thekaveman

.devcontainer/Dockerfile

@@ -9,8 +9,8 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 RUN useradd --create-home --shell /bin/bash $USER
 
 USER $USER
-ENV PATH="$PATH:/home/$USER/.local/bin"
 RUN mkdir -p /home/$USER/.config/compiler-admin
+ENV PATH="$PATH:/home/$USER/.local/bin:/home/$USER/.config/compiler-admin/gyb"
 WORKDIR /home/$USER/compiler-admin
 
 RUN python -m pip install --upgrade pip

.devcontainer/postAttach.sh

@@ -2,5 +2,3 @@
 set -eu
 
 pre-commit install --install-hooks
-
-echo -e "\nexport PATH=$PATH:/home/$USER/.config/compiler-admin/gyb" >> ~/.bashrc