Added ubuntu 20.04 support + fixed minor font issue.

release/ubuntu20.04/Dockerfile

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+FROM ubuntu:focal
+MAINTAINER p0rc0_r0ss0 <https://github.com/p0rc0jet>
+
+ENV LC_ALL="C.UTF-8" LANG="C.UTF-8" DEBIAN_FRONTEND=noninteractive
+
+RUN echo 'apt::install-recommends "false";' > /etc/apt/apt.conf.d/00recommends \
+    && apt update && apt upgrade -y \
+    && apt install -y --no-install-recommends gnupg apt-transport-https curl wget ca-certificates file \
+    && echo "deb https://zmrepo.zoneminder.com/debian/master focal/" > /etc/apt/sources.list.d/zm_focal.list \
+    && wget -O - https://zmrepo.zoneminder.com/debian/archive-keyring.gpg | apt-key add - \
+    && apt update \
+    && apt install -y zoneminder apache2 libapache2-mod-php \
+    && a2enconf zoneminder \
+    && a2enmod rewrite cgi
+
+VOLUME /var/cache/zoneminder/events /var/cache/zoneminder/images /var/lib/mysql /var/log/zm
+EXPOSE 80
+
+COPY patch/skin.css /usr/share/zoneminder/www/skins/classic/css/base/
+COPY utils/entrypoint.sh /usr/local/bin/
+RUN chmod 755 /usr/local/bin/entrypoint.sh
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

release/ubuntu20.04/README.md

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+# Zoneminder
+Based on ubuntu:focal minimal image. Only vital packages and dependencies added (which still grew package from 77MB to 700+MB).
+
+## Release notes
+- Added patched `skin.css` to get rid of "font not found" problem for good.
+- Release is intended to work with external MySQL only no internal MySQL server installed.
+- Dockerfile has been optimized to reduce number of container layers.
+- Version deployed through `docker-compose` exposes port 80 and can work standalone or with nginx reverse proxy.
+
+### A drop of lyrics
+I've been using Zoneminder for a long time and came up with conclusion that it is better to have separate mysql server for it. Because of this there is separate mysql container with no ports exposed outside, just to own network.
+
+## Getting started
+Can be deployed in few easy steps
+
+### Build
+Yeah, manual labour :)
+```bash
+mkdir -p /usr/src/zm_focal/patch
+wget https://raw.githubusercontent.com/p0rc0jet/zmdockerfiles/master/release/ubuntu20.04/patch/skin.css -P /usr/src/zm_focal/patch
+wget https://raw.githubusercontent.com/p0rc0jet/zmdockerfiles/master/release/ubuntu20.04/Dockerfile -P /usr/src/zm_focal
+cd /usr/src/zm_focal
+docker build /usr/src/zm_focal -f Dockerfile -t zm_focal_min
+```
+On success go to next step.
+
+### Compose and up
+I'll assume that MySQL container is up and running with name `zm_db`. 
+
+#### docker-compose.yml
+```yaml
+version: '3.5'
+
+services:
+
+  zm_focal:
+    image: zm_focal_min
+    container_name: zm_focal
+    #restart: unless-stopped
+    env_file:
+      - zm.env
+    volumes:
+      - /mnt/zm/zoneminder:/var/cache/zoneminder:rw
+      - /mnt/zm/logs:/var/log/zm
+      - /mnt/zm/logs:/var/log/zoneminder
+      - /dev/dri:/dev/dri
+    shm_size: "512mb"
+    privileged: false
+    environment:
+      - TZ=<your_time_zone_here>
+      - PUID=99
+      - PGID=100
+      - MULTI_PORT_START=0
+      - MULTI_PORT_END=0
+      - VIRTUAL_HOST=zm.domain.local
+    ports:
+      - "80:80"
+    networks:
+      - zm
+
+networks:
+  zm:
+    name: zm
+    driver: bridge
+```
+
+#### zm.env
+```bash
+ZM_DB_USER=zm
+ZM_DB_PASS=this_is_one_long_password_here
+ZM_DB_NAME=zm
+ZM_DB_HOST=zm_db
+```
+
+Finally
+```bash
+docker-compose up -d
+```
+
+### Connect
+`http://<your ip or hostname>/zm`
+
+