fix: normalize Additional Host Path Mounts textarea to a comma list (#740)

* fix: normalize Additional Host Path Mounts textarea to a comma list

The field's help text says "one per line", but the multiline value was
rendered into a single-quoted YAML scalar, which YAML-folds the newline
into a space. runtime-api then split only on commas/newlines, so the
space-joined value became one malformed token and was skipped — no
mounts. Normalize newlines to a comma list at render time (the proven
splitList/trim/join idiom used for the model textareas), so the env var
is always a clean single-line comma list. Works with the currently
deployed runtime-api too, no image rebuild required.

* chore: touch image-loader to trigger required chart CI

The branch-protection ruleset requires the 9 path-filtered
publish-charts(...) checks, which never run on replicated/-only PRs,
leaving them permanently BLOCKED. Touch a standalone chart to fire the
chart workflow so those checks report. (Also a true doc note.)

Author: ak684

charts/image-loader/values.yaml

@@ -1,3 +1,4 @@
+# Agent-server image the loader pre-pulls onto nodes; keep tag in sync with the sandbox runtime.
 image:
   repository: ghcr.io/openhands/agent-server
   tag: 1.28.0-python

replicated/openhands.yaml

@@ -314,7 +314,8 @@ spec:
         CPU_LIMIT: 'repl{{ ConfigOption "sandbox_cpu_limit" }}'
         LOG_LEVEL: 'repl{{ ConfigOption "log_level" }}'
         ADDITIONAL_CONFIGMAPS: "openhands-ca-bundle:/etc/openhands/ca-bundle"
-        ADDITIONAL_HOST_PATHS: 'repl{{ ConfigOption "sandbox_additional_host_paths" }}'
+        # Textarea is "one per line"; normalize to a comma list so a multiline value isn't YAML-folded into a space-joined token.
+        ADDITIONAL_HOST_PATHS: 'repl{{ $hp := list }}repl{{ range $raw := splitList "\n" (ConfigOption "sandbox_additional_host_paths" | replace "\r" "\n") }}repl{{ $e := trim $raw }}repl{{ if $e }}repl{{ $hp = append $hp $e }}repl{{ end }}repl{{ end }}repl{{ $hp | join "," }}'
         SANDBOX_KVM_ENABLED: 'repl{{ ConfigOptionEquals "sandbox_kvm_enabled" "1" }}'
         KVM_DEVICE_RESOURCE: "smarter-devices/kvm"
       kvm: