init(tests): added Justfile

tests/e2e/justfile

@@ -0,0 +1,40 @@
+#!/usr/bin/env just --justfile
+
+[group('help')]
+[private]
+default:
+    @ just --list --list-heading $'justfile manual page:\n'
+
+# show help
+[group('help')]
+help: default
+
+style:
+    just format
+    just lint
+    just mypy
+
+check:
+    just style
+
+# lints codebase using golangci-lint
+[group('lint')]
+lint:
+    @ uv run ruff check .
+
+# lints and fixes codebase using ruff
+[group('lint')]
+fix:
+    @ uv run ruff check . --fix
+
+# formats codebase using ruff
+[group('lint')]
+format:
+    @ uv run ruff format .
+
+alias fmt := format
+
+# lints codebase using mypy
+[group('lint')]
+mypy:
+    @ uv run mypy .