prograde/piwik-rpi repository overview

Based on prograde/php5.6-rpi, which is based on resin/rpi-raspbian instead of Debian. It's like https://github.com/docker-library/php/blob/ddc7084c8a78ea12f0cfdceff7d03c5a530b787e/5.6/apache/Dockerfile⁠ but with support for armhf.

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