fix: send artifacts to Gitea when jobs cannot reach the cache server (#1225)

Container jobs on a Docker bridge network isolated from the runner's cache server now upload artifacts to Gitea directly instead of timing out, with a job log warning on how to make the cache reachable.

Fixes https://gitea.com/gitea/runner/issues/1211

Reviewed-on: https://gitea.com/gitea/runner/pulls/1225
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

act/container/docker_stub.go

@@ -9,6 +9,7 @@ package container
 import (
 	"context"
 	"errors"
+	"net/netip"
 	"runtime"
 	"time"
 
@@ -17,6 +18,10 @@ import (
 	"github.com/moby/moby/api/types/system"
 )
 
+func IsolatedNetwork(context.Context, netip.Addr, string) (string, error) {
+	return "", nil
+}
+
 // ImageExistsLocally returns a boolean indicating if an image with the
 // requested name, tag and architecture exists in the local docker image store
 func ImageExistsLocally(ctx context.Context, imageName, platform string) (bool, error) {