build system: Enable static analysis in the CI

For a select set of boards, enable static analysis. The idea is that
the benefit of static analysis for multiple boards with the same
MCU family is rather limited and static analysis is costly in terms of
CPU time. So we select a small list of boards to covery many MCU family
without impacting CI time too much.

Author: maribu

Makefile.include

@@ -520,6 +520,29 @@ ifeq ($(RIOT_CI_BUILD),1)
     endif
     # be more quiet when building for CI
     QUIETER=1
+
+    # enable static analysis only for some boards to not spent to much CPU time
+    BOARDS_CI_STATIC_ANALYSIS := \
+      adafruit-itsybitsy-m4 \
+      esp32-wroom-32 \
+      esp32s3-devkit \
+      frdm-k64f \
+      hifive1b \
+      msb-430 \
+      msba2 \
+      native32 \
+      native64 \
+      nrf52840dk \
+      qn9080dk \
+      samr21-xpro \
+      stk3200 \
+      stm32f429i-disc1 \
+      #
+    ifneq (,$(filter $(BOARD),$(BOARDS_CI_STATIC_ANALYSIS)))
+      export STATIC_ANALYSIS := 1
+    else
+      export STATIC_ANALYSIS := 0
+    endif
 endif
 
 ifeq ($(QUIETER),1)