Pin Mariner 2.0 SIG image to 2022.08.29 temporarily (#2197) (#2200)

Co-authored-by: Henry Beberman <henry.beberman@microsoft.com>

Author: Ace Eldeib

pkg/agent/datamodel/sig_config.go

@@ -230,6 +230,9 @@ const (
 	// DO NOT MODIFY: used for freezing linux images with docker
 	FrozenLinuxSIGImageVersionForDocker string = "2022.09.13"
 
+	// Freezing the version of Mariner 2.0 until fix for cloud-init is published.
+	MarinerV2Gen2SIGImageVersion string = "2022.08.29"
+
 	LinuxSIGImageVersion string = "2022.09.13"
 
 	Windows2019SIGImageVersion string = "17763.3287.220810"
@@ -380,7 +383,7 @@ var (
 		ResourceGroup: AKSCBLMarinerResourceGroup,
 		Gallery:       AKSCBLMarinerGalleryName,
 		Definition:    "V2gen2",
-		Version:       LinuxSIGImageVersion,
+		Version:       MarinerV2Gen2SIGImageVersion,
 	}
 
 	SIGCBLMarinerV2Arm64ImageConfigTemplate = SigImageConfigTemplate{