sh.zio.backup: add get_dump_dir()

usr/local/bin/sh.zio.backup

@@ -98,6 +98,7 @@ function invoke_script() {
     export -f die
     export -f forget_backup
     export -f get_config_dir
+    export -f get_dump_dir
     export -f get_real_path
     export -f invoke_restic
     export -f podman_exec
@@ -179,6 +180,13 @@ function prune_backup() {
         --dry-run
 }
 
+function get_dump_dir() {
+    service="$1"
+    dumps_dir="/srv/dumps/$host/$service/$(date +"%Y%m%d%H%M%S")"
+    mkdir -p "$dumps_dir"
+    [[ $? == "0" ]] && echo "$dumps_dir"
+}
+
 function start_service() {
     service="$1"