Fix the issue that the make ktest CI could not identify failed results

Makefile

@@ -404,14 +404,27 @@ ktest: initramfs $(CARGO_OSDK)
 	@# 1. linux-bzimage-setup is excluded from ktest since it's hard to be unit tested;
 	@# 2. Artifacts are removed after testing each crate to save the limited disk space
 	@#    available to free-tier Github runners.
-	@for dir in $(OSDK_CRATES); do \
-		[ $$dir = "ostd/libs/linux-bzimage/setup" ] && continue; \
-		echo "[make] Testing $$dir"; \
-		(cd $$dir && cargo osdk test $(CARGO_OSDK_TEST_ARGS)) || exit 1; \
-		tail --lines 10 qemu.log | grep -q "^\\[ktest runner\\] All crates tested." \
-			|| (echo "Test failed" && exit 1); \
-		rm -r target/osdk/*; \
-	done
+	@# 3. Even if a crate test fails, we continue testing other crates but mark
+	@#    the overall result as failed.
+	@failed=0; \
+    for dir in $(OSDK_CRATES); do \
+        [ $$dir = "ostd/libs/linux-bzimage/setup" ] && continue; \
+        echo "[make] Testing $$dir"; \
+        if ! (cd $$dir && cargo osdk test $(CARGO_OSDK_TEST_ARGS)); then \
+            echo "ERROR: Testing $$dir failed"; \
+            failed=1; \
+        elif ! tail --lines 10 qemu.log | grep -q "^\\[ktest runner\\] All crates tested."; then \
+            echo "ERROR: Test verification failed for $$dir"; \
+            failed=1; \
+        fi; \
+        rm -rf target/osdk/*; \
+    done; \
+	if [ $$failed -ne 0 ]; then \
+        echo "SUMMARY: Some crate tests failed"; \
+        exit 1; \
+    else \
+        echo "SUMMARY: All crate tests passed"; \
+    fi
 
 .PHONY: docs
 docs: $(CARGO_OSDK)