Install zlib1g in the Docker image

Author: tchoutri

Dockerfile

@@ -29,7 +29,20 @@ RUN chown -R $USER:$USER /home/$USER/.cabal
 WORKDIR /flora-server
 
 RUN apt update && \
-  apt install -y build-essential curl libffi-dev libffi8 libgmp-dev libgmp10 libncurses-dev libncurses5 libtinfo5 git libsodium-dev pkg-config
+  apt install -y  \
+    build-essential \
+    curl \
+    libffi-dev \
+    libffi8 \
+    libgmp-dev \
+    libgmp10 \
+    libncurses-dev \
+    libncurses5 \
+    libtinfo5 \
+    git \
+    libsodium-dev \
+    pkg-config \
+    zlib1g-dev
 
 # install dependencies (pg_config, postgresql-client, yarn)
 ENV BOOTSTRAP_HASKELL_NONINTERACTIVE="YES"