feat: support container volume mount subpath (#1628)

* feat: support volumes subpath

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

* docs: add the kompose.volume.sub-path label

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

* fix: update e2e tests

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

---------

Signed-off-by: AhmedGrati <ahmedgrati1999@gmail.com>

pkg/loader/compose/compose.go

@@ -719,6 +719,8 @@ func parseKomposeLabels(labels map[string]string, serviceConfig *kobject.Service
 			serviceConfig.ImagePullSecret = value
 		case LabelImagePullPolicy:
 			serviceConfig.ImagePullPolicy = value
+		case LabelContainerVolumeSubpath:
+			serviceConfig.VolumeMountSubPath = value
 		default:
 			serviceConfig.Labels[key] = value
 		}

pkg/loader/compose/utils.go

@@ -81,6 +81,9 @@ const (
 	ServiceTypeHeadless = "Headless"
 	// LabelSecurityContextFsGroup defines the pod FsGroup
 	LabelSecurityContextFsGroup = "kompose.security-context.fsgroup"
+
+	// LabelContainerVolumeSubpath defines the volume mount subpath inside container
+	LabelContainerVolumeSubpath = "kompose.volume.subpath"
 )
 
 // load environment variables from compose file