fix Dockerfile

The provided Dockerfile was outdated, from using a 'cabal-install'
version that couldn't parse the cabal.project file (running into
<haskell/cabal#6013>) to using a ghc that
didn't have the required 'base' version.

Dockerfile

@@ -3,47 +3,42 @@
 # Build the container
 # $ docker build . -t siddhu/hackage-server
 #
-# Shell into the container
-# $ docker run -it -p 8080:8080 siddhu/hackage-server /bin/bash
-#
 # Run the server
-# Docker> # hackage-server run --static-dir=datafiles
+# $ docker run -it -p 8080:8080 siddhu/hackage-server
 #
 
-FROM ubuntu:18.04
+FROM haskell:9.10.1-slim-bullseye
+
+RUN apt-get update && cabal update
 
-RUN apt-get update
-RUN apt-get install -y software-properties-common
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y unzip libicu-dev postfix zlib1g-dev libssl-dev
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    libbrotli-dev \
+    libgd-dev \
+    libicu-dev \
+    libssl-dev \
+    pkg-config \
+    postfix \
+    unzip \
+    zlib1g-dev
 
-RUN apt-add-repository ppa:hvr/ghc
-RUN apt-get update
-RUN DEBIAN_FRONTEND=noninteractive apt-get install -y ghc-8.2.2 cabal-install-3.0
-ENV PATH /opt/ghc/bin:$PATH
-RUN cabal v2-update
-RUN mkdir /build
 WORKDIR /build
 ADD hackage-server.cabal cabal.project ./
-RUN cabal v2-build --only-dependencies --enable-tests -j
-RUN cabal v2-install hackage-repo-tool
+RUN cabal build --only-dependencies --enable-tests -j
+RUN cabal install hackage-repo-tool
 ENV PATH /root/.cabal/bin:$PATH
 ADD . ./
 RUN hackage-repo-tool create-keys --keys keys
 RUN cp keys/timestamp/*.private datafiles/TUF/timestamp.private
 RUN cp keys/snapshot/*.private datafiles/TUF/snapshot.private
 RUN hackage-repo-tool create-root --keys keys -o datafiles/TUF/root.json
 RUN hackage-repo-tool create-mirrors --keys keys -o datafiles/TUF/mirrors.json
-RUN cabal v2-build
-# tests currently don't pass: the hackage-security work introduced some
-# backup/restore errors (though they look harmless)
-# see https://github.com/haskell/hackage-server/issues/425
-#RUN cabal v2-test
-RUN cabal v2-install all
+RUN cabal build
+#RUN cabal test
+RUN cabal install all
 
 # setup server runtime environment
-RUN mkdir /runtime
-RUN cp -r /build/datafiles /runtime/datafiles
 WORKDIR /runtime
+RUN cp -r /build/datafiles /runtime/datafiles
 RUN hackage-server init --static-dir=datafiles
-CMD hackage-server run  --static-dir=datafiles
+CMD hackage-server run  --static-dir=datafiles --ip=0.0.0.0 --base-uri=http://localhost:8080
 EXPOSE 8080