minimal-os image definition. (#10520)

Co-authored-by: lanzeliu <lanzeliu@microsoft.com>

Author: liulanze

toolkit/imageconfigs/minimal-os.json

@@ -0,0 +1,55 @@
+{
+    "Disks": [
+        {
+            "PartitionTableType": "gpt",
+            "MaxSize": 500,
+            "Artifacts": [
+                {
+                    "Name": "minimal-os",
+                    "Type": "vhdx"
+                }
+            ],
+            "Partitions": [
+                {
+                    "ID": "boot",
+                    "Flags": [
+                        "esp",
+                        "boot"
+                    ],
+                    "Start": 1,
+                    "End": 9,
+                    "FsType": "fat32"
+                },
+                {
+                    "ID": "rootfs",
+                    "Start": 9,
+                    "End": 0,
+                    "FsType": "ext4"
+                }
+            ]
+        }
+    ],
+    "SystemConfigs": [
+        {
+            "Name": "Standard",
+            "BootType": "efi",
+            "PartitionSettings": [
+                {
+                    "ID": "boot",
+                    "MountPoint": "/boot/efi",
+                    "MountOptions": "umask=0077"
+                },
+                {
+                    "ID": "rootfs",
+                    "MountPoint": "/"
+                }
+            ],
+            "PackageLists": [
+                "packagelists/minimal-os-packages.json"
+            ],
+            "KernelOptions": {
+                "default": "kernel"
+            }
+        }
+    ]
+}

toolkit/imageconfigs/packagelists/minimal-os-packages.json

@@ -0,0 +1,36 @@
+{
+    "packages": [
+        "azurelinux-release",
+        "azurelinux-repos",
+        "azurelinux-rpm-macros",
+        "bash",
+        "ca-certificates",
+        "ca-certificates-base",
+        "dbus",
+        "dracut-hostonly",
+        "e2fsprogs",
+        "filesystem",
+        "grub2",
+        "grub2-efi-binary",
+        "iana-etc",
+        "initramfs",
+        "iproute",
+        "iputils",
+        "irqbalance",
+        "ncurses-libs",
+        "openssl",
+        "rpm",
+        "rpm-libs",
+        "shadow-utils",
+        "shim",
+        "sudo",
+        "systemd",
+        "systemd-networkd",
+        "systemd-resolved",
+        "systemd-udev",
+        "tdnf",
+        "tdnf-plugin-repogpgcheck",
+        "util-linux",
+        "zlib"
+    ]
+}