[software/co2] Shrink Docker image using multi-stage build

Ribbit-Network / ribbit-network-frog-hardware

The sensor for the world's largest crowdsourced network of open-source, low-cost, GHG Gas Detection Sensors.

https://www.ribbitnetwork.org/

MIT License

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[software/co2] Shrink Docker image using multi-stage build #97

Closed abesto closed 2 years ago

abesto commented 2 years ago

Part of #80. This takes the co2 image on beaglebone-green-gateway from 540MB to 410MB.

Special point of interest: Balena provides -build and -run images (see https://www.balena.io/docs/reference/base-images/base-images/#run-vs-build). We're now explicitly using them. In practice this just means we get to not manually install build-essentials and such, but seems like good practice anyway.

Tested on test-bbb-green/lingering-jam.