Add alpine-image template

It uses the official Alpine cloud images instead of the alpine-lima ISO.

Signed-off-by: Jan Dubois <[email protected]>

examples/alpine-image.yaml

@@ -0,0 +1,20 @@
+images:
+- location: "https://dl-cdn.alpinelinux.org/alpine/v3.19/releases/cloud/nocloud_alpine-3.19.1-x86_64-bios-cloudinit-r0.qcow2"
+  arch: "x86_64"
+  digest: "sha512:f122b0e9e832cf90bda49ca73b800105ab4aa193bd340cba641e6acbda1da9aa5571de87870561380ac69bdb2dcd428590e7b4a898f7f62b559f5c12a4aefc01"
+- location: "https://dl-cdn.alpinelinux.org/alpine/v3.19/releases/cloud/nocloud_alpine-3.19.1-aarch64-uefi-cloudinit-r0.qcow2"
+  arch: "aarch64"
+  digest: "sha512:d5e69cff0ecb0fd3850bd78f56f66131115934df27b2373c35a85a74b9def52822134dd43f90b4fabe239fdd4452026cb45f1c8f0b36a43af69335a26f0959b5"
+
+firmware:
+  legacyBIOS: true
+
+mounts:
+- location: "~"
+- location: "/tmp/lima"
+  writable: true
+
+# The built-in containerd installer does not support Alpine currently.
+containerd:
+  system: false
+  user: false