ci: run go unit tests from the dagger plan

Signed-off-by: Sam Alba <samalba@users.noreply.github.com>

Makefile

@@ -29,8 +29,8 @@ install: # Install a dev dagger binary
 	go install -ldflags '-X go.dagger.io/dagger/version.Revision=$(GIT_REVISION)' ./cmd/dagger
 
 .PHONY: test
-test: # Run all tests
-	go test -race -v ./...
+test: dagger # Run all tests
+	./cmd/dagger/dagger do test
 
 .PHONY: golint
 golint: dagger # Go lint
@@ -90,4 +90,4 @@ web: # Run the website locally
 
 .PHONY: todo
 todo: # Find all TODO items
-	grep -r -A 1 "TODO:" $(CURDIR)
+	grep -r -A 1 "TODO:" $(CURDIR)