Move conditional for tags to steps

Author: PHPirates

.github/workflows/release-pdf-on-tag.yml

@@ -1,9 +1,6 @@
 name: Release pdf on tag
 
-on:
-  push:
-    tags:
-      - '*'
+on: [push]
 
 env:
   FILE: main
@@ -22,6 +19,7 @@ jobs:
           name: main.zip
           path: src/*.pdf
       - name: Create Release
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
         id: create_release
         uses: actions/create-release@v1
         env:
@@ -32,12 +30,14 @@ jobs:
           draft: false
           prerelease: false
       - name: Prepare output path and output name
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
         id: prepare_metadata
         # upload-release-asset does not support wildcards or environment variables at the moment
         run: |
           echo ::set-output name=ARTIFACT_PATH::./src/$FILE.pdf
           echo ::set-output name=ARTIFACT_NAME::$FILE.pdf
       - name: Upload Release Asset
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
         uses: actions/upload-release-asset@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}