Upgrade to go1.21 and fix various lints #31
Merged
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This upgrades the go version in go.mod and in the (newly added) flake.nix to go1.21.
This also starts running golangci-lint in CI, and does a bunch of other small maintainership things, including addressing golangci-lint errors, and updating some tests to use more concise testing patterns.
This isn't meant to have any functional changes (other than fixing the json struct tag
omitEmpty
->omitempty
, which should be fine), just update the repo to be a little more modern.