fix: more robust docker context problem handling

See coop-cloud/organising#325
See coop-cloud/organising#340

pkg/upstream/commandconn/connection.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/url"
 
+	ctxPkg "coopcloud.tech/abra/pkg/context"
 	sshPkg "coopcloud.tech/abra/pkg/ssh"
 	"github.com/docker/cli/cli/connhelper"
 	"github.com/docker/cli/cli/connhelper/ssh"
@@ -36,6 +37,10 @@ func getConnectionHelper(daemonURL string, sshFlags []string) (*connhelper.Conne
 			return nil, errors.Wrap(err, "ssh host connection is not valid")
 		}
 
+		if err := ctxPkg.HasDockerContext(ctxConnDetails.Host); err != nil {
+			return nil, err
+		}
+
 		if err := sshPkg.EnsureHostKey(ctxConnDetails.Host); err != nil {
 			return nil, err
 		}