chore: add standard devenv.nix #5

...oss/libraries/go/utilities/pathfinder@v0.5.2/release.json

...i.com/oss/libraries/go/utilities/pathfinder@v0.5.2/set.go

.../oss/libraries/go/utilities/pathfinder@v0.5.2/set_test.go

...s/go/utilities/pathfinder@v0.8.1/.chglog/CHANGELOG.tpl.md

...braries/go/utilities/pathfinder@v0.8.1/.chglog/config.yml

...i.com/oss/libraries/go/utilities/pathfinder@v0.8.1/.envrc

...m/oss/libraries/go/utilities/pathfinder@v0.8.1/.gitignore

...s/libraries/go/utilities/pathfinder@v0.8.1/.gitlab-ci.yml

...libraries/go/utilities/pathfinder@v0.8.1/.idea/.gitignore

...braries/go/utilities/pathfinder@v0.8.1/.idea/markdown.xml

...s/libraries/go/utilities/pathfinder@v0.8.1/.idea/misc.xml

...ibraries/go/utilities/pathfinder@v0.8.1/.idea/modules.xml

...aries/go/utilities/pathfinder@v0.8.1/.idea/pathfinder.iml

...ss/libraries/go/utilities/pathfinder@v0.8.1/.idea/vcs.xml

....com/oss/libraries/go/utilities/pathfinder@v0.8.1/LICENSE

...om/oss/libraries/go/utilities/pathfinder@v0.8.1/README.md

...oss/libraries/go/utilities/pathfinder@v0.8.1/Taskfile.yml

.../oss/libraries/go/utilities/pathfinder@v0.8.1/devenv.lock

...m/oss/libraries/go/utilities/pathfinder@v0.8.1/devenv.nix

.../oss/libraries/go/utilities/pathfinder@v0.8.1/devenv.yaml