Update blogpost creation [skip-ci]

.github/workflows/make_blog_post.yml

@@ -9,18 +9,22 @@ jobs:
   post:
     runs-on: ubuntu-latest
     steps:
+      - name: Get tag name
+        id: get_tag_name
+        run: echo ::set-output name=TAGNAME::${GITHUB_REF/refs\/tags\//}
+
       - name: Checkout
         uses: actions/checkout@v2
         with:
-          ref: ${{ github.head_ref }}
+          ref: master
           path: main
 
       - name: Checkout website
         uses: actions/checkout@v2
         with:
           token: ${{ secrets.ROBO_ACTIONS }}
           repository: sigil-ebook/sigil-ebook.github.io
-          ref: ${{ github.head_ref }}
+          ref: master
           path: website
 
       - name: Get Release details
@@ -38,7 +42,7 @@ jobs:
           commit_user_name: My GitHub Actions Bot
           commit_user_email: [email protected]
           commit_author: Author <[email protected]>
-          commit_message: Auto create release blog post
+          commit_message: Auto create ${{ steps.get_tag_name.outputs.TAGNAME }} release blog post
           branch: master
 
       # Trigger sigil-ebook.com to update its version info