Add go build tag to docker_network.go (#44)

Fix the build failure in https://gitea.com/gitea/act_runner/actions/runs/278/jobs/0

Reviewed-on: https://gitea.com/gitea/act/pulls/44
Reviewed-by: Jason Song <[email protected]>
Co-authored-by: Zettat123 <[email protected]>
Co-committed-by: Zettat123 <[email protected]>

pkg/container/docker_network.go

@@ -1,3 +1,5 @@
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows))
+
 package container
 
 import (