Fix build script to check log content instead of exit code

- live-build doesn't return correct exit codes on failure
- Now checks for 'E:.*failure occurred' in build log
- This properly detects build failures and triggers retry logic
- Should now correctly handle the devuan-keyring error and retry

build.sh

@@ -37,33 +37,39 @@ fi
 echo "Starting ISO build..."
 lb build 2>&1 | tee build.log
 
-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
+# Check for build errors in the log instead of relying on exit code
+if grep -q "E:.*failure occurred" build.log; then
+    echo "DEBUG: Build failed based on log content"
     # Check if the error is about missing devuan-keyring
     if grep -q "Couldn't find these debs: devuan-keyring" build.log; then
+        echo "DEBUG: Detected missing devuan-keyring error"
         echo "Detected missing devuan-keyring. Downloading locally..."
         if apt-get download devuan-keyring 2>&1 | tee -a build.log; then
+            echo "DEBUG: apt-get download succeeded"
             echo "devuan-keyring downloaded successfully. Retrying build..."
             rm -f build.log
+            echo "DEBUG: Starting retry build..."
             lb build 2>&1 | tee build_retry.log
-            if [ $? -eq 0 ]; then
+            # Check retry log for errors
+            if grep -q "E:.*failure occurred" build_retry.log; then
+                echo "Build failed again. Check build_retry.log for errors."
+                exit 1
+            else
                 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 build_retry.log for errors."
-                exit 1
             fi
         else
+            echo "DEBUG: apt-get download failed"
             echo "Failed to download devuan-keyring. Build cannot continue."
             exit 1
         fi
     else
+        echo "DEBUG: Error is not about devuan-keyring"
         echo "Build failed. Check build.log for errors."
         exit 1
     fi
+else
+    echo "Build completed successfully!"
+    echo "ISO file: $(ls live-image-amd64.iso 2>/dev/null || ls *.iso 2>/dev/null || echo 'Not found')"
 fi
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