First try for a dockerized install

docker/.env

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+DATABASE_URL=mysql://davis:davis@127.0.0.1:3306/davis
+
+ADMIN_LOGIN=admin
+ADMIN_PASSWORD=test
+
+AUTH_REALM=SabreDAV
+
+AUTH_METHOD=Basic
+
+CALDAV_ENABLED=true
+CARDDAV_ENABLED=true
+WEBDAV_ENABLED=false
+
+TMP_DIR='/tmp'
+PUBLIC_DIR='/public'
+
+HOSTNAME=dav.mydomain.tld
+
+INVITE_FROM_ADDRESS=no-reply@example.org
+EMAIL=no-reply@mydomain.tld
+MAIL_HOST=smtp.myprovider.com
+MAIL_USERNAME=userdav
+MAIL_PASSWORD=test

docker/Dockerfile

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+FROM php:7.2-fpm
+
+# Mail : configuration for ssmtp
+ARG email
+ARG mail_host
+ARG hostname
+ARG mail_username
+ARG mail_password
+
+# Mail : compile ssmtp
+RUN curl -O http://cdn-fastly.deb.debian.org/debian/pool/main/s/ssmtp/ssmtp_2.64.orig.tar.bz2 && \
+    bunzip2 ssmtp_2.64.orig.tar.bz2 && \
+    tar -xvf ssmtp_2.64.orig.tar && \
+    cd ssmtp-2.64 && ./configure && make && \
+    echo "echo 'Skipping config generation'" > generate_config && make install && \
+    cd .. && rm -rf ssmtp-2.64 && rm ssmtp_2.64.orig.tar
+
+COPY configurations/php-mail.ini /usr/local/etc/php/conf.d/mail.ini
+RUN echo "root=${email}\nmailhub=${mail_host}\nrewriteDomain= \
+          \nhostname=${hostname}\nFromLineOverride=YES \
+          \nAuthUser=${mail_username}\nAuthPass=${mail_password}\n" > /usr/local/etc/ssmtp/ssmtp.conf
+
+# Run update, and gets basic packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        curl \
+        unzip \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Configure PHP extensions
+RUN docker-php-ext-configure pdo_mysql --with-pdo-mysql=mysqlnd \
+    && docker-php-ext-install pdo_mysql \
+    && docker-php-source delete
+
+# Davis installation
+
+RUN cd /tmp/ && curl --silent -LO https://github.com/tchapi/davis/archive/v1.0.0.zip \
+ && unzip /tmp/1.0.0.zip -d /var/www/ \
+ && rm -f /tmp/1.0.0.zip
+RUN mv /var/www/1.0.0 /var/www/davis
+
+WORKDIR /var/www/davis
+
+# Install dependencies, and migrate the database if needed
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+RUN composer install --no-ansi --no-dev --no-interaction --no-progress --optimize-autoloader
+RUN bin/console migrate --no-interaction
+
+RUN chown -Rf www-data:www-data .
+RUN chmod -Rf g+w .

docker/configurations/php-mail.ini

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+[mail function]
+sendmail_path = "/usr/local/sbin/ssmtp -t"

docker/docker-compose.yml

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+version: "3.7"
+
+services:
+
+  nginx:
+    image: nginx:alpine
+    container_name: nginx
+    env_file: .env
+    command: "/bin/sh -c 'while :; do sleep 6h & wait $${!}; nginx -s reload; done & nginx -g \"daemon off;\"'"
+    depends_on:
+      - davis
+    volumes:
+      - davis_www:/var/www/davis
+    ports:
+      - 80:80
+      - 443:443
+
+  mysql:
+    image: mariadb:latest
+    container_name: mysql
+    env_file: .env
+
+  davis:
+    build:
+      context: ./
+      dockerfile: ./Dockerfile
+      args:
+        email: ${INVITE_FROM_ADDRESS}
+        mail_host: ${MAIL_HOST}
+        calendar_domain: ${HOSTNAME}
+        mail_username: ${MAIL_USERNAME}
+        mail_password: ${MAIL_PASSWORD}
+    image: davis:master
+    container_name: davis
+    env_file: .env
+    depends_on:
+      - mysql
+    volumes:
+      - davis_www:/var/www/davis
+
+volumes:
+  davis_www:
+    name: davis_www