fix: resolve image resources correctly with subdirectory baseURLs

This fix handles Hugo's resource resolution issue when deploying to subdirectory paths
like GitHub Pages. The resources.Match function was failing because it was looking
for images with the full baseURL path instead of the relative path.

Changes:
- Strip baseURL prefix from imagePath before resource matching  
- Add fallback logic for resource resolution
- Maintain backward compatibility with existing configurations

Author: d-oit

layouts/shortcodes/gallery.html

@@ -18,8 +18,46 @@
     {{- $useExifCaption := false -}}
     {{- $images = .Page.Params.Resources -}} <!-- Fetch the resources defined in the frontmatter -->
 {{- else }}
-    {{- $images = resources.Match (printf "%s/*" $imagePath) -}} <!-- If not "submit", fall back to matching path -->
+    <!-- Fix for subdirectory baseURL deployments like GitHub Pages -->
+    {{- $cleanImagePath := $imagePath -}}
+    
+    <!-- Strip baseURL prefix if it exists in the imagePath -->
+    {{- $baseURLPath := strings.TrimSuffix "/" (strings.TrimPrefix ($.Site.BaseURL | urls.Parse).Path "/") -}}
+    {{- if and (ne $baseURLPath "") (hasPrefix $imagePath (printf "/%s/" $baseURLPath)) -}}
+        {{- $cleanImagePath = strings.TrimPrefix (printf "/%s/" $baseURLPath) $imagePath -}}
+    {{- else if hasPrefix $imagePath "/" -}}
+        {{- $cleanImagePath = strings.TrimPrefix "/" $imagePath -}}
+    {{- end -}}
+    
+    <!-- Ensure trailing slash for directory matching -->
+    {{- if not (hasSuffix $cleanImagePath "/") -}}
+        {{- $cleanImagePath = printf "%s/" $cleanImagePath -}}
+    {{- end -}}
+    
+    <!-- Try to match images with cleaned path -->
+    {{- $images = resources.Match (printf "%s*" $cleanImagePath) -}}
     {{- $images = where $images "MediaType.MainType" "image" -}}
+    
+    <!-- If no images found, try alternative matching patterns -->
+    {{- if eq (len $images) 0 -}}
+        <!-- Try without leading slash -->
+        {{- $altPath := strings.TrimPrefix "/" $imagePath -}}
+        {{- if not (hasSuffix $altPath "/") -}}
+            {{- $altPath = printf "%s/" $altPath -}}
+        {{- end -}}
+        {{- $images = resources.Match (printf "%s*" $altPath) -}}
+        {{- $images = where $images "MediaType.MainType" "image" -}}
+    {{- end -}}
+    
+    <!-- If still no images found, try the original path -->
+    {{- if eq (len $images) 0 -}}
+        {{- $originalPath := $imagePath -}}
+        {{- if not (hasSuffix $originalPath "/") -}}
+            {{- $originalPath = printf "%s/" $originalPath -}}
+        {{- end -}}
+        {{- $images = resources.Match (printf "%s*" $originalPath) -}}
+        {{- $images = where $images "MediaType.MainType" "image" -}}
+    {{- end -}}
 {{- end }}
 
 {{- if $useRandomImageStack -}}
@@ -127,4 +165,4 @@
             </div>
         {{ end }}
     {{- end }}
-</div>
+</div>