Update makefile.yml

Author: Ryuga2967

.github/workflows/makefile.yml

@@ -31,14 +31,18 @@ jobs:
       with:
         name: C-Study-Guideline.pdf
         path: C-Study-Guideline.pdf
+
+    - name: Get Today
+      id: date
+      run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
 
     - name: Create Release
       id: create_release
       uses: actions/create-release@v1
       env:
         GITHUB_TOKEN: ${{ secrets.CI_TOKEN }}
       with:
-        tag_name: UniqueTag
+        tag_name: tag-${{ steps.date.outputs.date }}
         release_name: Release ${{ github.ref }}
         draft: false
         prerelease: false