Update Dockerfile (linkedin#373)

* Update Dockerfile

- update to Ubuntu 20.04
- run package installation noninteractive
- before installing any other pip dependencies, install wheel first
  to remove any waring about messages about missing wheel

* Update Dockerfile

- include LICENSE in the container image
- remove unneeded copy of all files e.g. git directory

Dockerfile

@@ -1,7 +1,7 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
-RUN apt-get update && apt-get -y dist-upgrade \
-    && apt-get -y install libffi-dev libsasl2-dev python3-dev \
+RUN DEBIAN_FRONTEND=noninteractive apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -y -o Dpkg::Options::=--force-confold dist-upgrade \
+    && DEBIAN_FRONTEND=noninteractive apt-get -y -o Dpkg::Options::=--force-confold install libffi-dev libsasl2-dev python3-dev \
         sudo libldap2-dev libssl-dev python3-pip python3-setuptools python3-venv \
         mysql-client uwsgi uwsgi-plugin-python3 nginx \
     && rm -rf /var/cache/apt/archives/*
@@ -12,15 +12,15 @@ COPY src /home/oncall/source/src
 COPY setup.py /home/oncall/source/setup.py
 COPY MANIFEST.in /home/oncall/source/MANIFEST.in
 COPY README.md /home/oncall/source/README.md
+COPY LICENSE /home/oncall/source/LICENSE
 
 WORKDIR /home/oncall
 
 RUN chown -R oncall:oncall /home/oncall/source /var/log/nginx /var/lib/nginx \
     && sudo -Hu oncall mkdir -p /home/oncall/var/log/uwsgi /home/oncall/var/log/nginx /home/oncall/var/run /home/oncall/var/relay \
     && sudo -Hu oncall python3 -m venv /home/oncall/env \
-    && sudo -Hu oncall /bin/bash -c 'source /home/oncall/env/bin/activate && cd /home/oncall/source && pip install .'
+    && sudo -Hu oncall /bin/bash -c 'source /home/oncall/env/bin/activate && cd /home/oncall/source && pip install wheel && pip install .'
 
-COPY . /home/oncall
 COPY ops/config/systemd /etc/systemd/system
 COPY ops/daemons /home/oncall/daemons
 COPY ops/daemons/uwsgi-docker.yaml /home/oncall/daemons/uwsgi.yaml