Fallback if toml file parsing failed (#246)

.github/workflows/test.yml

@@ -200,3 +200,15 @@ jobs:
             exit 1
           fi
         shell: bash
+
+  test-malformed-pyproject-file-fallback:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install using malformed pyproject.toml
+        id: setup-uv
+        uses: ./
+        with:
+          pyproject-file: "__tests__/fixtures/malformed-pyproject-toml-project/pyproject.toml"
+      - run: uv sync
+        working-directory: __tests__/fixtures/uv-project