Create Dockerfile

.devcontainer/Dockerfile

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+ARG UBUNTU_TAG=20.04
+FROM ubuntu:"$UBUNTU_TAG"
+
+ENV LANG=C.UTF-8
+RUN \
+    apt-get update && \
+    apt-get install --assume-yes curl gcc git libgmp-dev make sudo
+
+ARG GHCUP_VERSION=0.1.17.2
+RUN \
+    curl --output /usr/local/bin/ghcup "https://downloads.haskell.org/~ghcup/$GHCUP_VERSION/x86_64-linux-ghcup-$GHCUP_VERSION" && \
+    chmod +x /usr/local/bin/ghcup && \
+    ghcup --version
+
+ARG USER_NAME=me
+RUN \
+    useradd --create-home --shell "$( which bash )" "$USER_NAME" && \
+    echo "$USER_NAME ALL=(ALL) NOPASSWD: ALL" | tee "/etc/sudoers.d/$USER_NAME"
+USER "$USER_NAME"
+ENV PATH="/home/$USER_NAME/.cabal/bin:/home/$USER_NAME/.ghcup/bin:$PATH"
+
+ARG GHC_VERSION=9.0.1
+RUN \
+    ghcup install ghc "$GHC_VERSION" --set && \
+    ghc --version
+
+ARG CABAL_VERSION=3.6.2.0
+RUN \
+    ghcup install cabal "$CABAL_VERSION" --set && \
+    cabal --version
+
+ARG HLS_VERSION=1.4.0
+RUN \
+    ghcup install hls "$HLS_VERSION" --set && \
+    haskell-language-server-wrapper --version