Build EPUB, lint it for 3.14

Author: m-aciek

.github/workflows/update-lint-and-build.yml

@@ -94,7 +94,7 @@ jobs:
       fail-fast: false
       matrix:
         version: [3.14, 3.13, 3.12, 3.11, '3.10', 3.9, 3.8]
-        format: [html, latex]
+        format: [html, latex, epub]
     needs: ['update-translation']
     steps:
       - uses: actions/setup-python@master
@@ -138,3 +138,16 @@ jobs:
         with:
           name: build-${{ matrix.version }}-pdf
           path: .
+
+  lint-epub:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: [3.14]
+    needs: ['build-translation']
+    continue-on-error: true
+    steps:
+      - uses: actions/download-artifact@master
+        with:
+          name: build-${{ matrix.version }}-epub
+      - run: uvx epubcheck