Remove the pixi install command from the Docker recipe as pixi is now set up in the Action workflow

Author: IshaanDesai

docker/Dockerfile

@@ -34,8 +34,6 @@ RUN apt-get update -qq && apt-get install -y --no-install-recommends \
     cmake \
     git \
     file \
-# curl for installing pixi
-    curl \
 # FANS dependencies \
     libhdf5-dev \
     libopenmpi-dev \
@@ -49,8 +47,6 @@ RUN apt-get update -qq && apt-get install -y --no-install-recommends \
     && apt-get autoremove --purge -y \
     && rm -rf /var/lib/apt/lists/*
 
-RUN curl -fsSL https://pixi.sh/install.sh | sh
-
 ################################################################################
 
 FROM fans_ci AS fans_dev