Updated CI to use book.pdf name

.github/workflows/publish.yaml

@@ -23,8 +23,6 @@ jobs:
           key: ${{ runner.os }}-tectonic-
       - name: Compile latex
         run: ./tectonic book.tex
-      - name: Rename PDF
-        run: mv book.pdf ${{ steps.extract_branch.outputs.branch }}.pdf
       - name: Upload
         uses: VAllens/gitea-publish-generic-packages@v1
         env:
@@ -33,7 +31,7 @@ jobs:
           token: ${{ secrets.token }}
           package_version: ${{ github.sha }}
           files: |-
-            ${{ steps.extract_branch.outputs.branch }}.pdf
+            book.pdf
       - uses: actions/cache@v3
         name: Tectonic cache
         with: