ci: github: reduce when we do doc builds
Rather than doing a doc build on every PR, limit it to PRs that either
touch a file in doc/, *.rst and what's listed as DOXY_SOURCES in
doc/CMakeLists.txt.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index ced5b0c..b2ec76d 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -140,6 +140,8 @@
# For incremental builds not to miss any source change this MUST be kept
# a superset of INPUT= and FILE_PATTERNS= in zephyr.doxyfile.in
+#
+# NOTE: any changes here should be reflected in .github/workflows/doc-build.yml
file(GLOB_RECURSE DOXY_SOURCES
${ZEPHYR_BASE}/include/*.[c,h,S]
${ZEPHYR_BASE}/kernel/include/kernel_arch_interface.h
