Use specific go build flag for acceptance tests

Author: joanlopez

Makefile

@@ -4,4 +4,4 @@ build:
 	go build -ldflags "-s -w -X 'github.com/friendsofgo/killgrave/internal/app/cmd._version=`git rev-parse --abbrev-ref HEAD`-`git rev-parse --short HEAD`'" -o bin/killgrave cmd/killgrave/main.go
 
 acceptance: build
-	@(cd acceptance && go test -count=1 -v ./...)
+	@(cd acceptance && go test -count=1 -tags=acceptance -v ./...)

acceptance/acceptance_test.go

@@ -1,3 +1,5 @@
+//go:build acceptance
+
 package acceptance
 
 import (