use devkitpro docker image

installing it via pacman everytime is unsupported and will lead to http 403 errors.

Dockerfile

@@ -1,26 +1,13 @@
-FROM  ubuntu:20.04  as  builder
+FROM  devkitpro/devkita64:latest  as  builder
 
 # install dependencies
 RUN   apt-get  update       \
   &&  apt-get  install  -y  \
-    curl                    \
-    apt-transport-https     \
     python3                 \
     python3-pip             \
-  &&  pip  install  keystone-engine  \
-;
-
-# install devkitpro
-RUN   ln  -s  /proc/self/mounts  /etc/mtab  \
-  &&  mkdir  /devkitpro/  \
-  &&  echo "deb [signed-by=/devkitpro/pub.gpg] https://apt.devkitpro.org stable main" >/etc/apt/sources.list.d/devkitpro.list  \
-  &&  curl --fail  -o /devkitpro/pub.gpg  https://apt.devkitpro.org/devkitpro-pub.gpg  \
-  &&  apt-get update  \
-  &&  DEBIAN_FRONTEND=noninteractive  apt-get  install  -y  devkitpro-pacman  \
-  &&  dkp-pacman  --noconfirm  -S switch-dev  \
+  &&  pip3  install  keystone-engine  \
 ;
 
 WORKDIR  /app/
 
-ENV  DEVKITPRO  /opt/devkitpro
 ENTRYPOINT  make