[Ubuntu] fix dotnet installation & scripts sorcing on 24.04 (#9950)

images/ubuntu/scripts/build/configure-apt.sh

@@ -4,6 +4,8 @@
 ##  Desc:  Configure apt, install jq and apt-fast packages.
 ################################################################################
 
+source $HELPER_SCRIPTS/os.sh
+
 # Stop and disable apt-daily upgrade services;
 systemctl stop apt-daily.timer
 systemctl disable apt-daily.timer

images/ubuntu/templates/ubuntu-24.04.pkr.hcl

@@ -183,13 +183,18 @@ build {
     inline          = ["mkdir ${var.image_folder}", "chmod 777 ${var.image_folder}"]
   }
 
+  provisioner "file" {
+    destination = "${var.helper_script_folder}"
+    source      = "${path.root}/../scripts/helpers"
+  }
+
   provisioner "shell" {
     execute_command = "sudo sh -c '{{ .Vars }} {{ .Path }}'"
     script          = "${path.root}/../scripts/build/configure-apt-mock.sh"
   }
 
   provisioner "shell" {
-    environment_vars = ["DEBIAN_FRONTEND=noninteractive"]
+    environment_vars = ["HELPER_SCRIPTS=${var.helper_script_folder}","DEBIAN_FRONTEND=noninteractive"]
     execute_command  = "sudo sh -c '{{ .Vars }} {{ .Path }}'"
     scripts          = [
       "${path.root}/../scripts/build/install-ms-repos.sh",
@@ -203,11 +208,6 @@ build {
     script          = "${path.root}/../scripts/build/configure-limits.sh"
   }
 
-  provisioner "file" {
-    destination = "${var.helper_script_folder}"
-    source      = "${path.root}/../scripts/helpers"
-  }
-
   provisioner "file" {
     destination = "${var.installer_script_folder}"
     source      = "${path.root}/../scripts/build"

images/ubuntu/toolsets/toolset-2404.json

@@ -219,13 +219,9 @@
     ],
     "dotnet": {
         "aptPackages": [
-            "dotnet-sdk-6.0",
-            "dotnet-sdk-7.0",
             "dotnet-sdk-8.0"
         ],
         "versions": [
-            "6.0",
-            "7.0",
             "8.0"
         ],
         "tools": [