ci: skip test workflow on docs-only PRs

Test suite takes a long time to run across the Python 3.10-3.14 matrix
and against real Athena. Docs-only changes don't exercise any code path
the tests cover, so skip the workflow when the diff is limited to
`docs/**` or top-level Markdown files.

The weekly cron schedule keeps tests running against master regardless.

Author: laughingman7743

.github/workflows/test.yaml

@@ -2,6 +2,9 @@ name: Test
 
 on:
   pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**.md'
   schedule:
     - cron:  '0 0 * * 0'