chore: Add just task for running the test matrix locally

justfile

@@ -37,6 +37,18 @@ fmt:
 
 run-tests: run-test-pytest run-test-bats
 
+run-test-matrix:
+    #!/usr/bin/env bash
+
+    set -eu
+
+    matrix=("3.11" "3.12" "3.13")
+    for version in "${matrix[@]}"; do
+        echo "running tests with python version: $version"
+        uv sync --all-extras -p "$version"
+        uv run -p "$version" just run-tests
+    done
+
 run-test-pytest:
     python -m pytest -v --cov={{justfile_directory()}} --cov-report html tests/pytest