Merge pull request 'create /tmp folder for the update' (#7) from fix-update-script into main

Reviewed-on: #7

.woodpecker/update.yaml

@@ -57,6 +57,8 @@ pipeline:
         trusted-users = @wheel
         experimental-features = nix-command flakes ca-derivations
         EOF
+      - mkdir /tmp
+      - chmod 1777 /tmp
       - yes '' | nix-shell ./scripts/update.nix --argstr max-workers 1
     when:
       - event: cron