Modify action to create a PDF on every release to count downloads.

.github/workflows/publish.yaml

@@ -1,7 +1,7 @@
 name: Publish PDF
 on:
-  push:
-    branches: ["main"]
+  release:
+    types: ["published"]
 jobs:
   publish:
     name: publish
@@ -23,7 +23,7 @@ jobs:
         uses: svenstaro/upload-release-action@v2
         with:
           asset_name: Sylabs_Singularity101.pdf
-          tag: "PDF"
-          #tag: ${{ github.ref }}
+          #tag: "PDF"
+          tag: ${{ github.ref }}
           overwrite: true
           file: _build/pdf/book.pdf

intro.md

@@ -19,7 +19,7 @@ This tutorial:
 If you wish to improve the contents of this course, feel free to share your
 feedback to [email protected]
 
-For your convenience, this course is also available in [PDF format](https://github.com/sylabs/singularity101/releases/download/PDF/Sylabs_Singularity101.pdf).
+For your convenience, this course is also available in [PDF format](https://github.com/sylabs/singularity101/releases/).
 
 ## Table of Contents