ci: Don't rebuild docs in CI when only CMakeLists.txt changes (#4539)

Signed-off-by: Larry Gritz <[email protected]>

.github/workflows/docs.yml

@@ -14,6 +14,7 @@ on:
       - '**.properties'
       - 'src/**.cpp'
       - '**.cmake'
+      - '**/CMakeLists.txt'
       - '**/run.py'
   pull_request:
     paths-ignore:
@@ -22,6 +23,7 @@ on:
       - '**.properties'
       - 'src/**.cpp'
       - '**.cmake'
+      - '**/CMakeLists.txt'
       - '**/run.py'
   schedule:
     # Full nightly build