Merge branch 'main' of github.com:wsmoses/Enzyme-Tutorial

Merge remote changes to the order and makefile of P2 into the main branch.

Author: ludgerpaehler

docker/Dockerfile

@@ -1,17 +1,14 @@
-# Use Alpine Linux as the parent image
 FROM ubuntu:20.04
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-RUN apt-get -y update
-
-RUN apt-get install -y wget gnupg lsb-core software-properties-common
-
-RUN wget -O key.key https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add key.key
-
-RUN apt-add-repository "deb http://apt.llvm.org/`lsb_release -c | cut -f2`/ llvm-toolchain-`lsb_release -c | cut -f2`-12 main"
-
-RUN apt-get install -y autoconf cmake ninja-build gcc g++ libtool gfortran llvm-12-dev clang-12 libopenmpi-dev openmpi-bin git
+RUN apt-get -y update && apt-get install -y --no-install-recommends curl gnupg lsb-core software-properties-common \
+    && curl -fsSL https://apt.llvm.org/llvm-snapshot.gpg.key|apt-key add - \
+    && apt-add-repository "deb http://apt.llvm.org/`lsb_release -c | cut -f2`/ llvm-toolchain-`lsb_release -c | cut -f2`-12 main" \
+    && apt-get install -y --no-install-recommends autoconf cmake ninja-build gcc g++ libtool gfortran llvm-12-dev clang-12 libopenmpi-dev openmpi-bin git \
+    && apt-get autoremove -y --purge \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
 
 # Get & install Enzyme
 RUN git clone https://github.com/wsmoses/Enzyme.git \
@@ -20,6 +17,8 @@ RUN git clone https://github.com/wsmoses/Enzyme.git \
     && cmake -G Ninja .. -DCMAKE_BUILD_TYPE=Debug \
     && ninja
 
-RUN update-alternatives --install /usr/bin/clang clang /usr/bin/clang-12 10 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-12
-RUN update-alternatives --install /usr/bin/opt opt /usr/bin/opt-12 10
-RUN update-alternatives --install /usr/bin/llvm-symbolizer llvm-symbolizer /usr/bin/llvm-symbolizer-12 10
+RUN update-alternatives --install /usr/bin/clang clang /usr/bin/clang-12 10 --slave /usr/bin/clang++ clang++ /usr/bin/clang++-12 \
+    && update-alternatives --install /usr/bin/opt opt /usr/bin/opt-12 10 \
+    && update-alternatives --install /usr/bin/llvm-symbolizer llvm-symbolizer /usr/bin/llvm-symbolizer-12 10
+
+ENV DEBIAN_FRONTEND=