Move docker images to ubuntu (#620)

* Move docker images to ubuntu

Co-authored-by: Michael Nutt <michael@nuttnet.net>

Dockerfile_light

@@ -1,8 +1,25 @@
-FROM node:16-bullseye
+FROM ubuntu:focal
+
+ENV \
+    NODE_ENV="production" \
+    CHOKIDAR_USEPOLLING=1 \
+    CHOKIDAR_INTERVAL=500
+
+RUN set -ex; \
+    export DEBIAN_FRONTEND=noninteractive; \
+    groupadd -r node; \
+    useradd -r -g node node; \
+    apt-get -qq update; \
+    apt-get -y --no-install-recommends install \
+      ca-certificates \
+      wget; \
+    wget -qO- https://deb.nodesource.com/setup_16.x | bash; \
+    apt-get install -y nodejs; \
+    apt-get -y remove wget; \
+    apt-get -y --purge autoremove; \
+    apt-get clean; \
+    rm -rf /var/lib/apt/lists/*;
 
-ENV NODE_ENV="production"
-ENV CHOKIDAR_USEPOLLING=1
-ENV CHOKIDAR_INTERVAL=500
 EXPOSE 80
 VOLUME /data
 WORKDIR /data
@@ -12,3 +29,4 @@ RUN mkdir -p /usr/src/app
 COPY / /usr/src/app
 RUN cd /usr/src/app && npm install --production
 RUN ["chmod", "+x", "/usr/src/app/docker-entrypoint.sh"]
+USER node:node