fix path and add slides

Author: Vladimir Kotal

.github/workflows/pdfs.yml

@@ -39,6 +39,16 @@ jobs:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
         upload_url: ${{ steps.create_release.outputs.upload_url }}
-        asset_path: ./unix-linux-prog-in-c.pdf
+        asset_path: ./master/unix-linux-prog-in-c.pdf
         asset_name: unix-linux-prog-in-c.pdf
         asset_content_type: application/pdf
+    - name: Upload PDF slides
+      id: upload-release-asset
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ steps.create_release.outputs.upload_url }}
+        asset_path: ./master/unix-linux-prog-in-c_slides-only.pdf
+        asset_name: unix-linux-prog-in-c_slides-only.pdf
+        asset_content_type: application/pdf