No need nesting.

Author: pawchen

.github/workflows/optimize.yml

@@ -22,7 +22,40 @@ jobs:
 
   optimize:
     needs: convert
-    uses: ./.github/workflows/optimize.yml
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download converted artifact
+        uses: actions/download-artifact@v8
+        with:
+          name: converted
+          path: pages
+
+      - name: Install tools
+        run: |
+          sudo apt-get install -y webp minify parallel
+
+      - name: Optimize still images
+        run: >
+          find pages/ \( -iname "*.png" -o -iname "*.jpg" -o -iname "*.jpeg" \) -print0
+          | parallel -0 'cwebp -lossless -q 100 {} -o {.}.webp && rm {}'
+
+      - name: Optimize gif images
+        run: >
+          find pages/ -iname "*.gif" -print0
+          | parallel -0 'gif2webp -min_size -q 100 {} -o {.}.webp && rm {} || echo "::warning::Skipped optimizing {}"'
+
+      - name: Optimize text
+        run: |
+          find pages/ -name "*.html" | parallel minify --html-keep-document-tags --html-keep-end-tags --html-keep-whitespace -o {} {}
+          find pages/ -name "*.css"  | parallel minify -o {} {}
+          find pages/ -name "*.js"   | parallel minify -o {} {}
+
+      - name: Upload optimized artifact
+        uses: actions/upload-artifact@v7
+        with:
+          name: optimized
+          path: pages
+          retention-days: 1
 
   deploy:
     needs: optimize

.github/workflows/publish_book.yml

@@ -6,7 +6,6 @@
   <Folder Name="/Solution Items/Workflows/">
     <File Path="../.github/workflows/converter.yml" />
     <File Path="../.github/workflows/deploy.yml" />
-    <File Path="../.github/workflows/optimize.yml" />
     <File Path="../.github/workflows/publish_book.yml" />
     <File Path="../.github/workflows/publish_index.yml" />
   </Folder>