test: enable race detector

Unfortunately we can only enable the race detector for ci and unit
tests.
system-tests are building the apm-server binary (CGO disabled by default)
so we can't enable the race detector as it requires cgo.

Author: kruskall

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
           cache: true
       - env:
           CGO_ENABLED: "0"
-        run: go test -v ./...
+        run: go test -v -race ./...
 
   system-test:
     runs-on: ubuntu-latest

Makefile

@@ -78,11 +78,11 @@ apm-server-oss:
 
 .PHONY: test
 test:
-	@go test $(GOMODFLAG) $(GOTESTFLAGS) ./...
+	@go test $(GOMODFLAG) $(GOTESTFLAGS) -race ./...
 
 .PHONY: system-test
 system-test:
-	@(cd systemtest; go test $(GOMODFLAG) $(GOTESTFLAGS) -timeout=20m ./...)
+	@(cd systemtest; go test $(GOMODFLAG) $(GOTESTFLAGS) -race -timeout=20m ./...)
 
 .PHONY:
 clean: