Mr. Φίλιππος

Hi Adam, I have few more features to add. Please review.

Hi Borislav! Thank you for the script it is great. I add Raspberry Pi kernel headers support int Makefile, all the rest changes remains untouched. Please review code and accept...

Moved to Alpine Linux base image (from Debian) to reduce container image size 10 times: ```bash philipp@d3vpi:~/build/rpi_export $ docker image ls | grep rpi_exporter | grep -E 'alpine|debian' d3vilh/rpi_exporter-arm64 alpine...