Fix container network issue (#56)

Follow: https://gitea.com/gitea/act_runner/pulls/184
Close https://gitea.com/gitea/act_runner/issues/177

#### changes:
- `act` create new networks only if the value of `NeedCreateNetwork` is true, and remove these networks at last. `NeedCreateNetwork` is passed by `act_runner`. 'NeedCreateNetwork' is true only if  `container.network` in the configuration file of the `act_runner` is empty.
- In the `docker create` phase, specify the network to which containers will connect. Because, if not specify , container will connect to `bridge` network which is created automatically by Docker.
  - If the network is user defined network ( the value of `container.network` is empty or `<custom-network>`.  Because, the network created by `act` is also user defined network.), will also specify alias by `--network-alias`. The alias of service is `<service-id>`. So we can be access service container by `<service-id>:<port>` in the steps of job.
- Won't try to `docker network connect ` network after `docker start` any more.
  - Because on the one hand,  `docker network connect` applies only to user defined networks, if try to `docker network connect host <container-name>` will return error.
  - On the other hand, we just specify network in the stage of `docker create`, the same effect can be achieved.
- Won't try to remove containers and networks berfore  the stage of `docker start`, because the name of these containers and netwoks won't be repeat.

Co-authored-by: Jason Song <i@wolfogre.com>
Reviewed-on: https://gitea.com/gitea/act/pulls/56
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: sillyguodong <gedong_1994@163.com>
Co-committed-by: sillyguodong <gedong_1994@163.com>

pkg/container/docker_run.go

@@ -16,6 +16,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/docker/docker/api/types/network"
 	networktypes "github.com/docker/docker/api/types/network"
 
 	"github.com/go-git/go-billy/v5/helper/polyfill"
@@ -477,7 +478,21 @@ func (cr *containerReference) create(capAdd []string, capDrop []string) common.E
 			return err
 		}
 
-		resp, err := cr.cli.ContainerCreate(ctx, config, hostConfig, nil, platSpecs, input.Name)
+		// For Gitea
+		// network-scoped alias is supported only for containers in user defined networks
+		var networkingConfig *network.NetworkingConfig
+		if hostConfig.NetworkMode.IsUserDefined() && len(input.NetworkAliases) > 0 {
+			endpointConfig := &network.EndpointSettings{
+				Aliases: input.NetworkAliases,
+			}
+			networkingConfig = &network.NetworkingConfig{
+				EndpointsConfig: map[string]*network.EndpointSettings{
+					input.NetworkMode: endpointConfig,
+				},
+			}
+		}
+
+		resp, err := cr.cli.ContainerCreate(ctx, config, hostConfig, networkingConfig, platSpecs, input.Name)
 		if err != nil {
 			return fmt.Errorf("failed to create container: '%w'", err)
 		}