Do not show missing user error if there is no ssh-key provided

fixes https://gitlab.alpinelinux.org/alpine/cloud/tiny-cloud/-/issues/41

lib/tiny-cloud/init

@@ -217,6 +217,11 @@ init__set_hostname() {
 }
 
 init__set_ssh_keys() {
+    local sshkeys="$(imds @ssh-keys)"
+    if [ -z "$sshkeys" ]; then
+        log -i -t "$phase" info "$ACTION: no ssh key found"
+        return
+    fi
     local user="$CLOUD_USER"
     local pwent="$(getent passwd "$user")"
     if [ -z "$pwent" ]; then
@@ -235,7 +240,7 @@ init__set_ssh_keys() {
     touch "$keys_file"
     chmod 600 "$keys_file"
     $MOCK chown -R "$user:$group" "$ssh_dir"
-    imds @ssh-keys > "$keys_file"
+    echo "$sshkeys" > "$keys_file"
 }
 
 init__save_userdata() {

tests/tiny-cloud.test

@@ -54,6 +54,7 @@ no_userdata_main_body() {
 		# we should not set empty hostname
 		# we should not create .ssh dir for non-existing user
 		CLOUD="$provider" atf_check \
+			-e not-match:"failed" \
 			-e not-match:"unknown" \
 			-o not-match:"hostname.*-F" \
 			-o not-match:"chown.*/\.ssh" \