Review Makefile

docs/content/contributing/building-testing.md

@@ -43,6 +43,19 @@ $ ls dist/
 traefik*
 ```
 
+The following targets can be executed outside Docker (we don't recommend that):
+
+- `test-unit`
+- `test-integration`
+- `validate`
+- `binary` (the webUI is still generated by using Docker)
+
+ex:
+
+```bash
+PRE_TARGET= make test-unit
+```
+
 ### Method 2: Using `go`
 
 You need `go` v1.9+.