Added support for source_snapshot on instance template (IBM-Cloud#6364)

* Added support for source_snapshot on instance template

* updated the instance template data source to handle unmarshalling

* Added source template to instance datasource

Author: uibm

ibm/acctest/acctest.go

@@ -104,6 +104,8 @@ var (
 	InstanceName                    string
 	InstanceProfileName             string
 	InstanceProfileNameUpdate       string
+	ISCatalogImageName              string
+	ISBootSnapshotID                string
 	IsBareMetalServerProfileName    string
 	IsBareMetalServerImage          string
 	IsBareMetalServerImage2         string
@@ -972,6 +974,18 @@ func init() {
 		fmt.Println("[INFO] Set the environment variable SL_INSTANCE_PROFILE_UPDATE for testing ibm_is_instance resource else it is set to default value 'cx2-4x8'")
 	}
 
+	ISCatalogImageName = os.Getenv("IS_CATALOG_IMAGE_NAME")
+	if ISCatalogImageName == "" {
+		ISCatalogImageName = "test-catalog"
+		fmt.Println("[INFO] Set the environment variable IS_CATALOG_IMAGE_NAME for testing ibm_is_instance_template resource else it is set to default value 'test-catalog'")
+	}
+
+	ISBootSnapshotID = os.Getenv("IS_BOOT_SNAPSHOT_ID")
+	if ISBootSnapshotID == "" {
+		ISBootSnapshotID = "r006-d7fejbe-2dhj-442df-b2iha-ccjbecbjbcejce"
+		fmt.Println("[INFO] Set the environment variable IS_BOOT_SNAPSHOT_ID for testing ibm_is_instance_template resource else it is set to default value 'r006-d7fejbe-2dhj-442df-b2iha-ccjbecbjbcejce'")
+	}
+
 	IsBareMetalServerProfileName = os.Getenv("IS_BARE_METAL_SERVER_PROFILE")
 	if IsBareMetalServerProfileName == "" {
 		IsBareMetalServerProfileName = "bx2-metal-96x384" // for next gen infrastructure