nixos/Containerfile

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# Automatic NixOS upgrades (modules/server/system.nix) requires updating
# flake.lock in the repository periodically. This repository is hosted on
# Gitea, which doesn't have good support for CI. Instead, this Containerfile
# is run on a server. This requires a Gitea access token[1] with repository
# read/write permissions. Note that we must use an account-wide access token to
# be able to clone through HTTPS (and utilise certificates rather than blindly
# trusting SSH keys), as repository deploy keys can only be used through
# SSH. The token should be passed as the GIT_PASSWORD environment variable.
# [1] https://git.caspervk.net/user/settings/applications
FROM nixos/nix:2.21.0
CMD git clone https://caspervk:$GIT_PASSWORD@git.caspervk.net/caspervk/nixos.git && \
cd nixos/ && \
git config user.email "snowflake@caspervk.net" && \
git config user.name "snowflake" && \
nix --extra-experimental-features nix-command --extra-experimental-features flakes flake update --commit-lock-file && \
git push && \
cd .. && \
rm -rf nixos/ && \
sleep 7d # Run again in a week. Requires `restart: unless-stopped`