Broken pipe?

Author: pawchen

.github/workflows/publish_book.yml

@@ -36,34 +36,32 @@ jobs:
 
       - name: Optimize still images
         run: |
-          find pages/ \( -iname "*.png" -o -iname "*.jpg" -o -iname "*.jpeg" \) -print0 \
-          | parallel -0 << 'EOF'
-              msg=$(cwebp -quiet -lossless -q 100 {} -o {.}.webp 2>&1 >/dev/null)
-              status=$?
-              if [ $status -eq 0 ]; then
-                rm {}
-                if [ -n "$msg" ]; then
-                  echo "::notice::Optimized {}, but had warnings: $msg"
-                fi
-              else
-                echo "::warning::Skipped optimizing {} because $msg"
+          parallel -0 -a < (find pages/ \( -iname "*.png" -o -iname "*.jpg" -o -iname "*.jpeg" \) -print0) << 'EOF'
+            msg=$(cwebp -quiet -lossless -q 100 {} -o {.}.webp 2>&1 >/dev/null)
+            status=$?
+            if [ $status -eq 0 ]; then
+              rm {}
+              if [ -n "$msg" ]; then
+                echo "::notice::Optimized {}, but had warnings: $msg"
               fi
+            else
+              echo "::warning::Skipped optimizing {} because $msg"
+            fi
           EOF
 
       - name: Optimize gif images
         run: |
-          find pages/ -iname "*.gif" -print0 \
-          | parallel -0 << 'EOF'
-              msg=$(gif2webp -quiet -min_size -q 100 {} -o {.}.webp 2>&1 >/dev/null)
-              status=$?
-              if [ $status -eq 0 ]; then
-                rm {}
-                if [ -n "$msg" ]; then
-                  echo "::notice::Optimized {}, but had warnings: $msg"
-                fi
-              else
-                echo "::warning::Skipped optimizing {} because $msg"
+          parallel -0 -a < (find pages/ -iname "*.gif" -print0) << 'EOF'
+            msg=$(gif2webp -quiet -min_size -q 100 {} -o {.}.webp 2>&1 >/dev/null)
+            status=$?
+            if [ $status -eq 0 ]; then
+              rm {}
+              if [ -n "$msg" ]; then
+                echo "::notice::Optimized {}, but had warnings: $msg"
               fi
+            else
+              echo "::warning::Skipped optimizing {} because $msg"
+            fi
           EOF
 
       - name: Optimize text