make: add race+coverprofile to test target; add build-caldav target

- test target now runs with -race and emits coverage.out for coverage
  reporting.
- New build-caldav target builds cmd/mavcaldav without CGO (pure Go).
- build-caldav added to PHONY and build dependency chain.
- mavcaldav added to clean target.

Makefile

@@ -8,11 +8,11 @@ PIPER_BIN     := $(shell pwd)/deps/piper/piper
 PIPER_MODEL   := $(shell pwd)/models/tts/ru_RU-irina-medium.onnx
 PIPER_ESPEAK  := $(shell pwd)/deps/piper/espeak-ng-data
 
-.PHONY: all build build-stt build-tts build-daemon build-client build-web build-poll clean test run-stt run-tts run-web
+.PHONY: all build build-stt build-tts build-daemon build-client build-web build-poll build-caldav clean test run-stt run-tts run-web
 
 all: build
 
-build: build-stt build-tts build-daemon build-client build-web build-poll
+build: build-stt build-tts build-daemon build-client build-web build-poll build-caldav
 
 build-stt:
 	CGO_CFLAGS="$(CGO_CFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" LD_LIBRARY_PATH="$(shell pwd)/deps/lib" \
@@ -36,12 +36,15 @@ build-web:
 build-poll:
 	$(GO) build $(GOFLAGS) -o mavpoll ./cmd/mavpoll/
 
+build-caldav:
+	$(GO) build $(GOFLAGS) -o mavcaldav ./cmd/mavcaldav/
+
 run-web: build-web
 	./mavweb -addr :9200 -voice 127.0.0.1:9100
 
 test:
 	CGO_CFLAGS="$(CGO_CFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" LD_LIBRARY_PATH="$(shell pwd)/deps/lib" \
-		$(GO) test ./internal/... ./cmd/...
+		$(GO) test -race -coverprofile=coverage.out ./internal/... ./cmd/...
 
 run-stt: build-stt
 	LD_LIBRARY_PATH="$(shell pwd)/deps/lib" \
@@ -69,4 +72,4 @@ deps-piper:
 	tar -xzf /tmp/piper.tar.gz -C deps/
 
 clean:
-	rm -f mavend mavenclient mavsttd mavttsd mavweb mavpoll
+	rm -f mavend mavenclient mavsttd mavttsd mavweb mavpoll mavcaldav