👷 CI : update workflows

.github/workflows/GitHub_Pages_Deploy.yml

@@ -1,4 +1,5 @@
 name: Deploy to GitHub Pages
+on: [push]
 uses: maxheld83/ghpages@v0.2.1
 if: success() && github.event == 'push' && github.ref == 'master'
 env:

.github/workflows/issue-reference.yml

@@ -1,4 +1,5 @@
 name: Add an issue reference
+on: [pull_request]
 uses: kentaro-m/add-an-issue-reference-action@v1.0.0
 env:
   GITHUB_TOKEN: ${{ secrets.ACTION_TOKEN }}