feat(pwa): Use build timestamp for $pwa.version

Signed-off-by: Khusika Dhamar Gusti <[email protected]>

Author: khusika

layouts/_partials/pwa.html

@@ -1,4 +1,5 @@
-{{- $pwa := .Scratch.Get "pwa" -}}
+{{- $pwa := dict "version" now.Unix -}}
+{{- .Scratch.Set "pwa" $pwa -}}
 <script>
 if ('serviceWorker' in navigator) {
     navigator.serviceWorker