[TASK] Address review feedback on template overrides

- Remove mkdir -p /templates from Dockerfile: Docker creates mount
  targets automatically when bind mounts are used, so the directory
  only exists when someone intentionally mounts templates. This avoids
  unnecessary filesystem lookups on every template resolution.
- Add is_readable() checks alongside is_dir() for defensive robustness
  against permission issues.

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

Dockerfile

@@ -31,8 +31,6 @@ ARG TYPO3AZUREEDGEURIVERSION
 ENV TYPO3AZUREEDGEURIVERSION=$TYPO3AZUREEDGEURIVERSION
 
 WORKDIR /project
-RUN mkdir -p /templates
-
 ENTRYPOINT [ "/opt/guides/entrypoint.sh" ]
 CMD ["-h"]
 

packages/typo3-docs-theme/src/DependencyInjection/Typo3DocsThemeExtension.php

@@ -100,12 +100,12 @@ public function prepend(ContainerBuilder $container): void
         $templates = [];
 
         // Docker volume mount: highest custom priority
-        if (is_dir('/templates')) {
+        if (is_dir('/templates') && is_readable('/templates')) {
             $templates[] = '/templates';
         }
 
         // Project-bundled templates: second custom priority
-        if (is_dir('/project/resources/custom-templates')) {
+        if (is_dir('/project/resources/custom-templates') && is_readable('/project/resources/custom-templates')) {
             $templates[] = '/project/resources/custom-templates';
         }