hm. maybe like this. also force runners to go on fructose as glucose seems to be having a problem at the moment.

.forgejo/workflows/check.yaml

@@ -3,6 +3,7 @@ on:
   pull_request_target:
 jobs:
   format:
+    runs_on: fructose
     name: "nix fmt"
     steps:
       - name: Checkout repository

.forgejo/workflows/flake-update.yaml

@@ -6,6 +6,7 @@ on:
     - cron: '0 2 * * *'
 jobs:
   flake-update:
+    runs_on: fructose
     name: "Update .lock file"
     steps:
       - name: Checkout repository
@@ -28,4 +29,10 @@ jobs:
             this is an automated action
           pr-labels: |
             dependencies
-            automated
+            automated
+      - name: Checkout CI branch
+        run: git checkout update_flake_lock_action
+        if: ${{ steps.update.outputs.pull-request-number }}
+      - name: Force push changes to CI branch
+        run: git push origin update_flake_lock_action --force
+        if: ${{ steps.update.outputs.pull-request-number }}