runconfig: add and populate Runtime.Arch

internal/runconfig/runconfig.go

@@ -59,6 +59,7 @@ func genRuntime(c *config.Config, ce *config.Runtime, variables map[string]strin
 
 	return &rstypes.Runtime{
 		Type:       rstypes.RuntimeType(ce.Type),
+		Arch:       ce.Arch,
 		Containers: containers,
 	}
 }

internal/services/runservice/types/types.go

@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/mitchellh/copystructure"
+	"github.com/sorintlab/agola/internal/common"
 	"github.com/sorintlab/agola/internal/util"
 )
 
@@ -366,6 +367,7 @@ type RegistryAuth struct {
 
 type Runtime struct {
 	Type       RuntimeType  `json:"type,omitempty"`
+	Arch       common.Arch  `json:"arch,omitempty"`
 	Containers []*Container `json:"containers,omitempty"`
 }