fix: ensure cache directory is writable by www-data

Dockerfile

@@ -19,4 +19,6 @@ RUN echo "*" > "/app/public/whitelist.txt" && \
     chown -R www-data:www-data /app/public && \
     chmod -R 775 /app/public/cache
 
+RUN chown www-data:www-data /data/caddy && chmod 2770 /data/caddy
+
 USER www-data

renovate.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "customManagers": [
+    {
+      "customType": "regex",
+      "description": "Detect ARG VERSION pin for jcabillot/phpapache base image",
+      "managerFilePatterns": [
+        "/^Dockerfile$/"
+      ],
+      "matchStrings": [
+        "ARG\\s+VERSION=\"(?<currentValue>[^\"]+)\""
+      ],
+      "depNameTemplate": "jcabillot/phpapache",
+      "datasourceTemplate": "docker"
+    }
+  ]
+}