Revert "ci: Remove GIT_USERNAME"

This reverts commit c022fc9.

Author: sorairolake

.github/workflows/mirror.yaml

@@ -25,6 +25,7 @@ jobs:
         uses: yesolutions/[email protected]
         with:
           REMOTE: "https://gitlab.com/sorairolake/nt-time.git"
+          GIT_USERNAME: sorairolake
           GIT_PASSWORD: ${{ secrets.GITLAB_TOKEN }}
           PUSH_ALL_REFS: "false"
 
@@ -41,5 +42,6 @@ jobs:
         uses: yesolutions/[email protected]
         with:
           REMOTE: "https://codeberg.org/sorairolake/nt-time.git"
+          GIT_USERNAME: sorairolake
           GIT_PASSWORD: ${{ secrets.CODEBERG_TOKEN }}
           PUSH_ALL_REFS: "false"