fix: make dotnet runnable.

tests/test_install_scripts.py

@@ -0,0 +1,10 @@
+from pathlib import Path
+
+
+def test_dotnet_wrapper_uses_sandbox_writable_runtime_directories() -> None:
+    root = Path(__file__).parents[1]
+    script = (root / "install-scripts" / "dotnet").read_text()
+
+    assert 'DOTNET_CLI_HOME="${DOTNET_CLI_HOME:-/tmp/agentci-dotnet}"' in script
+    assert 'NUGET_PACKAGES="${NUGET_PACKAGES:-/tmp/agentci-nuget/packages}"' in script
+    assert 'mkdir -p "$DOTNET_CLI_HOME" "$NUGET_PACKAGES"' in script