ci: fix rom header checker to validate *rom* on word boundaries
# Examples shouldn't include rom headers directly
output=$(find ${IDF_PATH}/examples -name "*.[chS]" -o -name "*.cpp" -not -path "**/build/**")
-files=$(grep ".*include.*rom.*h" ${output} | cut -d ":" -f 1)
+files=$(egrep ".*include.*\<rom\>.*h" ${output} | cut -d ":" -f 1)
found_rom=0
for file in ${files}
do
