fix: move from devenv to nix flake and add test for environment with quotes

integration_test.go

licenses/github.com/r3labs/diff/v3/.github/workflows/ci.yml

licenses/github.com/r3labs/diff/v3/diff_examples_test.go

licenses/github.com/r3labs/diff/v3/diff_test.go

licenses/github.com/r3labs/diff/v3/go.mod

licenses/github.com/r3labs/diff/v3/go.sum

licenses/github.com/r3labs/diff/v3/patch_test.go

nix/config/common-packages.nix

nix/config/defaults.nix

nix/config/release.nix

nix/config/release.nix.template

nix/packages/manual.nix

nix/scripts/bash-fkt.nix

nix/scripts/build-cover-report.nix

nix/scripts/build-manual.nix

nix/scripts/go-task.nix

nix/scripts/release.nix

nix/scripts/run-ci-tests.nix

nix/scripts/run-extended-tests.nix

nix/scripts/run-tests.nix