compiler: Speedup & troubleshooting debug messages (#240)

* compiler: Speedup stripFromRootfs and add debug log

* compiler: on stripFromRootfs show files removed with debug

pkg/compiler/compiler.go

@@ -195,11 +195,15 @@ func (cs *LuetCompiler) stripFromRootfs(includes []string, rootfs string, includ
 		for _, i := range includeRegexp {
 			if i.MatchString(abspath) {
 				match = true
+				break
 			}
 		}
 
 		if include && !match || !include && match {
 			toRemove = append(toRemove, currentpath)
+			Debug(":scissors: Removing file", currentpath)
+		} else {
+			Debug(":sun: Matched file", currentpath)
 		}
 
 		return nil