Updated Dockerfile

Dockerfile

@@ -1,16 +1,26 @@
 # Base image
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
 # Variables
 ENV CRAWL_REPO=https://github.com/crawl/crawl.git \
   BUILD_DEPS="autoconf bison build-essential flex git" \
-  APP_DEPS="bzip2 python-minimal ncurses-term locales-all sqlite3 libpcre3 liblua5.1-0 locales lsof libncursesw5-dev libsqlite3-dev sudo libbot-basicbot-perl"
+  APP_DEPS="bzip2 python3-minimal python3-pip ncurses-term locales-all sqlite3 libpcre3 liblua5.1-0 locales lsof libncursesw5-dev libsqlite3-dev sudo libbot-basicbot-perl"
 
 # Logic
-RUN apt update && \
-  upgrade -y && \
-  install -y ${BUILD_DEPS} ${APP_DEPS}
+RUN apt-get update && \
+  apt-get upgrade -y && \
+  apt-get install -y ${BUILD_DEPS} ${APP_DEPS}
 
+# Install Tornado
 RUN pip3 install tornado
 
+# Retrieve crawl
 RUN git clone ${CRAWL_REPO} /src/
+
+# Clean up unnecessary packages
+RUN apt-get remove -y ${BUILD_DEPS} && \
+  apt-get autoremove --purge -y && \
+  rm -rf /var/lib/apt/lists/*
+
+# Expose ports
+EXPOSE 8080