Configure Matomo to use environment variables using Docker

Dockerfile

# Extend the official Matomo Docker image
FROM matomo:3.13.0

# Install unzip
RUN apt update && apt install -y unzip

# Download, unzip and install the EnvironmentVariables plugin
RUN curl -o EnvironmentVariables.zip \
      https://plugins.matomo.org/api/2.0/plugins/EnvironmentVariables/download/latest \
      && unzip EnvironmentVariables.zip \
      && rm EnvironmentVariables.zip \
      && mv EnvironmentVariables /usr/src/matomo/plugins

# Bring along our personalized Matomo config file
COPY config.ini.php /usr/src/matomo/config/config.ini.php