Fallback during search for config file. Site root is considered when no file is found

lib/Dancer2/Core/App.pm

@@ -727,6 +727,9 @@ sub BUILD {
     my $self = shift;
     $self->init_route_handlers();
     $self->_init_hooks();
+
+    #Siteroot is saved as fallback when no config file is found using App's path
+    Dancer2->runner->set_siteroot($self->location) if($self->name && $self->name eq 'main');
 }
 
 sub finish {

lib/Dancer2/Core/Role/ConfigReader.pm

@@ -104,9 +104,9 @@ sub _build_default_config { +{} }
 sub _build_environment { 'development' }
 
 sub _build_config_files {
-    my ($self) = @_;
+    my ($self, $forced_location) = @_;
 
-    my $location = $self->config_location;
+    my $location = $forced_location || $self->config_location;
     # an undef location means no config files for the caller
     return [] unless defined $location;
 
@@ -124,8 +124,23 @@ sub _build_config_files {
             push @files, $path;
         }
     }
-
-    return [ sort @files ];
+    if(@files)
+    {
+        return [ sort @files ];
+    }
+    else
+    {
+        #If no file is found in the app config path, search will be repeated under the siteroot.
+        #This fallback will not be activated if a forced_location is provided (to avoid loop)
+        if(! $forced_location && Dancer2->runner->config->{'siteroot'})
+        {
+            return $self->_build_config_files(Dancer2->runner->config->{'siteroot'});
+        }
+        else
+        {
+            return [ sort @files ]; #Dumb answer, @files is still empty
+        }
+    }
 }
 
 sub _build_config {

lib/Dancer2/Core/Runner.pm

@@ -106,6 +106,12 @@ sub _build_config {
     };
 }
 
+sub set_siteroot {
+    my $self = shift;
+    my $siteroot = shift;
+    $self->config->{'siteroot'} = $siteroot;
+}
+
 sub BUILD {
     my $self = shift;