fix commit

Author: rvl

scripts/update-external.nix

@@ -18,10 +18,13 @@ in
 
     ${script}
 
+    echo "Committing changes..."
+    export GIT_COMMITTER_NAME="IOHK"
+    export GIT_COMMITTER_EMAIL="devops+nix-tools@iohk.io"
+    export GIT_AUTHOR_NAME="$GIT_COMMITTER_NAME"
+    export GIT_AUTHOR_EMAIL="$GIT_COMMITTER_EMAIL"
     git add .
-    git commit --allow-empty \
-        --message "Automatic update for $(date)" \
-        --author="IOHK <devops+nix-tools@iohk.io>"
+    git commit --allow-empty --message "Automatic update for $(date)"
 
     rev=$(git rev-parse HEAD)