ci: rebuild trigger 3 (transient TLS-timeout mot docker.io i run #8)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/build.yaml

@@ -7,7 +7,7 @@ name: build-and-push
 # (ingen insecure-registry-config behövs där).
 #
 # Pull:a på Pi5 med  localhost:5000/archivum:latest  (t.ex. i dockge-stacken).
-# rebuild trigger: 2 (previous run was interrupted by a host overload)
+# rebuild trigger: 3 (run #8 hit a transient TLS timeout pulling alpine:3.20)
 on:
   push:
     branches: [main, master]