ci: Use a job matrix for translations and combine the artifacts in the publish job

Author: michael-kerscher

.github/workflows/publish.yml

@@ -12,10 +12,12 @@ on:
 env:
   CARGO_TERM_COLOR: always
   # Update the language picker in index.hbs to link new languages.
-  LANGUAGES: ar bn da de el es fa fr id it ja ko pl pt-BR ro ru tr uk vi zh-CN zh-TW
 
 jobs:
-  publish:
+  create-translation:
+    strategy:
+      matrix:
+        language: ["en", "ar", "bn", "da", "de", "el", "es", "fa", "fr", "id", "it", "ja", "ko", "pl", "pt-BR", "ro", "ru", "tr", "uk", "vi", "zh-CN", "zh-TW"]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -38,14 +40,32 @@ jobs:
         uses: ./.github/workflows/install-mdbook
 
       - name: Build course in English
+        if: matrix.language == 'en'
         run: .github/workflows/build.sh en book
 
-      - name: Build all translations
+      - name: Build ${{ matrix.language }} translation
+        if: matrix.language != 'en'
         run: |
-          for po_lang in ${{ env.LANGUAGES }}; do
-              .github/workflows/build.sh $po_lang book/$po_lang
-              mv book/$po_lang/html book/html/$po_lang
-          done
+          .github/workflows/build.sh ${{ matrix.language }} book/${{ matrix.language }}
+          mkdir book/html
+          mv book/${{ matrix.language }}/html book/html/${{ matrix.language }}
+
+      - name: Upload translation
+        uses: actions/upload-artifact@v4
+        with:
+          name: comprehensive-rust-${{ matrix.language }}
+          path: book/
+
+  publish:
+    runs-on: ubuntu-latest
+    needs: create-translation
+    steps:
+      - name: Download all translations
+        uses: actions/download-artifact@v4
+        with:
+          path: book/
+          pattern: comprehensive-rust-*
+          merge-multiple: true
 
       - name: Build translation report
         run: i18n-report report book/html/translation-report.html po/*.po
@@ -56,3 +76,9 @@ jobs:
           MDBOOK_OUTPUT='{"xgettext": {"pot-file": "messages.pot", "granularity": 0}}' mdbook build -d synced-po
           for file in synced-po/*.po; do msgmerge --update $file synced-po/messages.pot ; done
           i18n-report report book/html/synced-translation-report.html synced-po/*.po
+      
+      - name: Upload all translations (for verification)
+        uses: actions/upload-artifact@v4
+        with:
+          name: comprehensive-rust-all
+          path: book/