Add configuration file for RTFD

Author: masklinn

.readthedocs.yaml

@@ -0,0 +1,29 @@
+# Read the Docs configuration file for Sphinx projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+version: 2
+
+build:
+  os: ubuntu-24.04
+  tools:
+    python: "3.12"
+  post_checkout:
+    # rtfd doesn't retrieve tags by default, but we need them for `git
+    # describe` in order to build the parser builtins
+    # FIXME: remove once upb is published and can be installed from pypi)
+    - git fetch --unshallow --tags || true
+
+python:
+  install:
+    - method: pip
+      path: ./ua-parser-builtins
+    - method: pip
+      path: .
+      extra_requirements:
+        - yaml
+        - regex
+        - re2
+
+sphinx:
+  configuration: docs/conf.py
+  fail_on_warning: true