Add userdata/** to workflow path filters (#149)

Changes to static config files like Caddyfile weren't triggering the
tofu plan workflow, even though they affect infrastructure (via the
instance_replacement_hash). Add 'opentofu/**/userdata/**' pattern to
catch all userdata files.

Author: noahwhite

.github/workflows/pr-tofu-plan-develop.yml

@@ -35,6 +35,7 @@ jobs:
               - 'opentofu/**/*.bu'
               - 'opentofu/**/*.tftpl'
               - 'opentofu/**/*.sh'
+              - 'opentofu/**/userdata/**'
               - 'docker/scripts/**'
               - '.github/workflows/pr-tofu-*.yml'
               - '.github/workflows/deploy-dev.yml'