Add docs.sh script

docs.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+
+# Renders the docs, prints the location of the docs, opens the docs if possible
+#
+# Does not run the link checker. That's done in runtest.sh.
+
+nix --option sandbox false \
+    build --override-input haskell-flake path:${FLAKE} \
+    -L --show-trace \
+    github:hercules-ci/flake.parts-website \
+    "$@"
+
+echo "Docs rendered to $PWD/result/options/haskell-flake.html"
+
+# Works on linux
+if type xdg-open &>/dev/null; then
+  xdg-open result/options/haskell-flake.html
+fi