Switch to nginx from buster, which is new enough

Dockerfile

@@ -14,33 +14,7 @@ RUN pip wheel -w /wheels -r /requirements.txt
 FROM ghcr.io/praekeltfoundation/vumi-base:0.1.1
 MAINTAINER Praekelt Foundation <[email protected]>
 
-# TODO: Do we want a newer nginx?
-# Install a modern Nginx
-ENV NGINX_VERSION=1.14.2 \
-    NGINX_GPG_KEY=573BFD6B3D8FBC641079A6ABABF5BD827BD9BF62
-RUN set -ex; \
-    fetchDeps=" \
-        wget \
-        $(command -v gpg > /dev/null || echo 'dirmngr gnupg') \
-    "; \
-    apt-get-install.sh $fetchDeps; \
-    wget https://nginx.org/keys/nginx_signing.key; \
-    [ "$(gpg -q --with-fingerprint --with-colons nginx_signing.key | awk -F: '/^fpr:/ { print $10 }')" \
-        = $NGINX_GPG_KEY ]; \
-    apt-key add nginx_signing.key; \
-    codename="$(. /etc/os-release; echo $VERSION | grep -oE [a-z]+)"; \
-    echo "deb http://nginx.org/packages/debian/ $codename nginx" > /etc/apt/sources.list.d/nginx.list; \
-    rm nginx_signing.key; \
-    apt-get-purge.sh $fetchDeps; \
-    \
-    apt-get-install.sh "nginx=$NGINX_VERSION-1\~$codename"; \
-# Delete default server
-    rm /etc/nginx/conf.d/default.conf; \
-# Create directories for Junebug frontends/upstreams
-    mkdir -p /etc/nginx/includes/junebug; \
-# Forward Nginx access and error logs to stdout/err
-    ln -sf /dev/stdout /var/log/nginx/access.log; \
-    ln -sf /dev/stderr /var/log/nginx/error.log
+RUN apt-get-install.sh nginx
 
 COPY requirements.txt /requirements.txt
 COPY --from=builder /wheels /wheels