Fix ImageMagick policy.xml path for version 7 support

The install script now detects whether ImageMagick 6 or 7 is installed
and modifies the appropriate policy.xml file. This fixes installation
failures on systems using ImageMagick 7 where the policy file is at
/etc/ImageMagick-7/policy.xml instead of /etc/ImageMagick-6/policy.xml.

Bump version to 1.1.0.

Author: claude

src/imagemagick/NOTES.md

@@ -2,6 +2,8 @@
 
 This feature installs [ImageMagick](https://imagemagick.org/), a powerful image processing and manipulation library, along with Ghostscript for enhanced PDF support in container environments.
 
+**Supported Versions**: This feature supports both ImageMagick 6 and ImageMagick 7, automatically detecting and configuring the installed version.
+
 ## Key Configuration
 
 **PDF Processing Support**: The feature automatically configures ImageMagick to process PDF files by modifying the security policy, enabling PDF manipulation operations which are often restricted by default.

src/imagemagick/devcontainer-feature.json

@@ -1,6 +1,6 @@
 {
   "id": "imagemagick",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "name": "imagemagick",
   "description": "Installs imagemagick",
   "options": {},

src/imagemagick/install.sh

@@ -6,6 +6,11 @@ apt-get -y install --no-install-recommends ghostscript imagemagick
 apt-get autoremove -y
 rm -rf /var/lib/apt/lists/*
 
-# Enables ImageMagic to process PDF files
+# Enables ImageMagick to process PDF files
 # Ref. https://askubuntu.com/a/1181773
-sed -i 's/rights="none" pattern="PDF"/rights="read | write" pattern="PDF"/' /etc/ImageMagick-6/policy.xml
+# Supports both ImageMagick 6 and 7
+if [ -f /etc/ImageMagick-6/policy.xml ]; then
+    sed -i 's/rights="none" pattern="PDF"/rights="read | write" pattern="PDF"/' /etc/ImageMagick-6/policy.xml
+elif [ -f /etc/ImageMagick-7/policy.xml ]; then
+    sed -i 's/rights="none" pattern="PDF"/rights="read | write" pattern="PDF"/' /etc/ImageMagick-7/policy.xml
+fi