fix: skip inaccessible images to avoid build failure (#1301)

* skip inaccessible images to avoid build failure

* undo changes to $result and $local

* fix: initialize $resource as a dictionary instead of an empty string

* feat: add external image processing timeout configuration

---------

Co-authored-by: Jimmy Cai <jimmy@cai.im>

layouts/_partials/helper/image.html

@@ -14,7 +14,12 @@
 {{ if .Image }}
     {{ $url := urls.Parse .Image }}
     {{ $permalink := .Image }}
-    {{ $resource := "" }}
+    {{ $resource := dict
+        "Resource" nil
+        "Permalink" $permalink
+        "Height" nil
+        "Width" nil
+    }}
     {{ $local := true }}
 
     {{ if not (in (slice "https" "http") $url.Scheme) }}
@@ -22,14 +27,14 @@
         {{ $resource = .Resources.Get (printf "%s" (.Image | safeURL)) }}
     {{ else }}
         {{/* Remote image */}}
-        {{ with try (resources.GetRemote $url) }}
+        {{ with try (resources.GetRemote $url (dict "timeout" .Context.Site.Params.imageProcessing.external.timeout)) }}
             {{ with .Err }}
-                {{ errorf "%s" . }}
+                {{ warnf "Failed to fetch remote resource %q: %s" $url . }}
             {{ else with .Value }}
                 {{ $resource = . }}
                 {{ $local = false }}
             {{ else }}
-                {{ errorf "Unable to get remote resource %q" $url }}
+                {{ warnf "Unable to get remote resource %q" $url }}
             {{ end }}
         {{ end }}   
     {{ end }}