Fix build script to handle missing devuan-keyring

- Added error detection for missing devuan-keyring package
- If devuan-keyring is missing, download it locally using apt-get download
- Retry the build after downloading the package
- This prevents build failure when devuan-keyring is not available

build.sh

@@ -35,12 +35,35 @@ if [ "$EUID" -ne 0 ]; then
 fi
 
 echo "Starting ISO build..."
-lb build
+lb build 2>&1 | tee build.log
 
-if [ $? -eq 0 ]; then
+BUILD_EXIT_CODE=$?
+
+if [ $BUILD_EXIT_CODE -eq 0 ]; then
     echo "Build completed successfully!"
     echo "ISO file: $(ls live-image-amd64.iso 2>/dev/null || ls *.iso 2>/dev/null || echo 'Not found')"
 else
-    echo "Build failed. Check the output above for errors."
-    exit 1
+    # Check if the error is about missing devuan-keyring
+    if grep -q "Couldn't find these debs: devuan-keyring" build.log; then
+        echo "Detected missing devuan-keyring. Downloading locally..."
+        if apt-get download devuan-keyring; then
+            echo "devuan-keyring downloaded successfully. Retrying build..."
+            rm -f build.log
+            lb build
+            if [ $? -eq 0 ]; then
+                echo "Build completed successfully!"
+                echo "ISO file: $(ls live-image-amd64.iso 2>/dev/null || ls *.iso 2>/dev/null || echo 'Not found')"
+                exit 0
+            else
+                echo "Build failed again. Check the output above for errors."
+                exit 1
+            fi
+        else
+            echo "Failed to download devuan-keyring. Build cannot continue."
+            exit 1
+        fi
+    else
+        echo "Build failed. Check the output above for errors."
+        exit 1
+    fi
 fi
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