fix: remove bash SHELL directive incompatible with Alpine FrankenPHP

Reviewed-on: #10

Dockerfile

@@ -1,8 +1,6 @@
 FROM dunglas/frankenphp:1-php8.5-alpine
 LABEL maintainer="Julien Cabillot <dockerimages@cabillot.eu>"
 
-SHELL ["/bin/bash", "-o", "pipefail", "-c"]
-
 WORKDIR /app
 
 # Install required PHP extensions for RSS-Bridge
@@ -10,8 +8,10 @@ RUN install-php-extensions mbstring simplexml curl json iconv
 
 COPY Caddyfile /etc/frankenphp/Caddyfile
 
-# Download RSS-Bridge
-RUN curl -s -L "https://github.com/RSS-Bridge/rss-bridge/tarball/master/" | tar -zx --strip=1 -C /app/public
+# Download RSS-Bridge (two-step to avoid pipefail dependency)
+RUN curl -s -L "https://github.com/RSS-Bridge/rss-bridge/tarball/master/" -o /tmp/rssbridge.tar && \
+    tar -zx --strip=1 -C /app/public -f /tmp/rssbridge.tar && \
+    rm /tmp/rssbridge.tar
 
 # Configure RSS-Bridge
 RUN echo "*" > "/app/public/whitelist.txt" && \

renovate.json

@@ -1,3 +1,17 @@
 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+  "$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"
+    }
+  ]
 }