forgejo: use git credentials to feed env variables of user and pass

.forgejo/workflows/pages.yaml

@@ -6,7 +6,8 @@ jobs:
     container:
       image: alpine:latest
     env:
-      GH_TOKEN: ${{ secrets.PAGES_TOKEN }}
+      GIT_USER: ayakael
+      GIT_PASS: ${{ secrets.PAGES_TOKEN }}
     steps:
       - name: Environment setup
         run: |
@@ -30,7 +31,7 @@ jobs:
           # Note: the following account information will not work on GHES
           git config user.name "forgejo-actions[bot]"
           git config user.email "dev@ayakael.net"
-          git config user.password $GH_TOKEN
+          git config credential.helper "!f() { echo \"username=${GIT_USER}\\npassword=${GIT_PASS}\"; }; f"
           git add .
           git commit -m "Update"
           git push