chore: remove redundant configs now handled globally

Dockerfile

@@ -1,4 +1,4 @@
-FROM php:8.5-apache
+FROM php:7.4-apache
 LABEL maintainer="Julien Cabillot <dockerimages@cabillot.eu>"
 
 

renovate.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "customManagers": [
+    {
+      "customType": "regex",
+      "description": "Detect Docker images in Jenkins pipeline files",
+      "fileMatch": [
+        "Jenkinsfile$",
+        "Jenkinsfile-pod-template\\.yml$"
+      ],
+      "matchStrings": [
+        "image:\\s*['\"]?(?<depName>[^'\"\\s]+):(?<currentValue>[^'\"\\s]+)['\"]?"
+      ],
+      "datasourceTemplate": "docker"
+    }
+  ]
+}