[CI] run-make: experimental thumb test

src/test/run-make/thumb-none-cortex-m/Makefile

@@ -0,0 +1,21 @@
+# Don't use the definitions
+#-include ../../run-make-fulldeps/tools.mk
+
+ifeq ($(TARGET),thumbv7m-none-eabi)
+
+#TMP_DIR := $(shell mktemp -d)
+TMP_DIR := /tmp/safe_place
+CRATE := cortex-m
+
+all:
+	env > env.txt
+	mkdir -p $(TMP_DIR)
+	-cd $(TMP_DIR) && rm -rf $(CRATE)
+	cd $(TMP_DIR) && $(CARGO) clone $(CRATE) --vers 0.5.0
+	pwd
+	cd $(TMP_DIR) && cd $(CRATE) && $(CARGO) build --target $(TARGET)
+else
+
+all:
+
+endif