Improve SDK Conformance error reporting (#3331)

* Improve SDK Conformance error reporting

Attempting to make it easier to see when and how SDK conformance tests
either pass or fail.

build/includes/sdk.mk

@@ -150,11 +150,13 @@ run-sdk-conformance-no-build: ensure-build-sdk-image
 run-sdk-conformance-test: TRIES=5
 run-sdk-conformance-test: ensure-agones-sdk-image
 run-sdk-conformance-test: ensure-build-sdk-image
+	@echo "\n\n^^^ Building: $(SDK_FOLDER)\n\n"
 	$(MAKE) run-sdk-command COMMAND=build-sdk-test
-	for try in `seq 1 $(TRIES)`; do \
-	  $(MAKE) run-sdk-conformance-no-build && echo "+++ Success: $(SDK_FOLDER)" && break || \
-	    status=$$? && echo "*** Failure: $(SDK_FOLDER), try $$try/$(TRIES)"; \
-	done; (exit $$status)
+	@for try in `seq 1 $(TRIES)`; do \
+	  echo "\n\n>>> Starting: ($$try/$(TRIES)) $(SDK_FOLDER)\n\n" && \
+	  $(MAKE) run-sdk-conformance-no-build && echo "\n\n+++ Success: ($$try/$(TRIES)) $(SDK_FOLDER)\n\n" && break || \
+	    echo "\n\n*** Failure: ($$try/$(TRIES)) $(SDK_FOLDER)\n\n" && false; \
+	done
 
 run-sdk-conformance-test-cpp:
 	$(MAKE) run-sdk-conformance-test SDK_FOLDER=cpp GRPC_PORT=9003 HTTP_PORT=9103

cloudbuild.yaml

@@ -193,7 +193,7 @@ steps:
     - cpp-sdk-build-restore-cache
     - ensure-build-sdk-image-base
   dir: "build"
-  args: [ "-j", "4", "--output-sync=target", "build-sdks"]
+  args: [ "-j", "4", "--output-sync=recurse", "build-sdks"]
 
 #
 # Cache the cpp sdk build directory, to speed up subsequent builds (considerably)