add reproduction code

Author: CHC383

.github/workflows/mise.yaml

@@ -0,0 +1,27 @@
+name: Test mise
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    name: Test mise with uv and automatic virtualenv activation
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+
+      - name: Install mise
+        uses: jdx/mise-action@v2
+        with:
+          cache: true
+
+      - run: which python
+
+      - run: python --version

.python-version

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+3.13.5

README.md

@@ -1 +1,17 @@
-# mise-github-action-debug
+# mise-github-action-debug
+
+Reproduction for
+
+## Context
+
+Using `mise` + `uv` in GitHub workflows with automatic Python virtualenv
+activation doesn't work. Running `python` causes the workflow hangs and memory
+leak.
+
+## Current behavior
+
+The step `python --version` in `.github/workflows/mise.yaml` hangs.
+
+## Expected behavior
+
+`mise` automatically activates `uv` virtualenv without any issues.

mise.toml

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+[settings]
+experimental = true
+python.uv_venv_auto = true
+idiomatic_version_file_enable_tools = [ "python" ]

pyproject.toml

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+[project]
+name = "mise-github-action-debug"
+version = "0.1.0"
+requires-python = ">=3.13.5"
+
+[tool.uv]
+required-version = ">=0.7.21"