balena-chromium-kiosk
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ENV breaks docker cache
Ive found the cache wasnt working and I was getting painful rebuilds. It seems like this line it to blame
https://github.com/jayatvars/balena-chromium-kiosk/blob/master/Dockerfile.template#L3
Presumably this was pasted in along with the other systemd stuff which brings up another question
Since you're already using privileged: true and ENV INITSYSTEM on so Im not sure what a manual service is providing here. Theres a comment about input but I dont understand if theres anything special in there. Note they dont do anything similar in their x11 example https://github.com/balena-io-playground/x11-window-manager/
Ive pulled all that out and need to do some additional testing yet but it seems to be good?