upgrades: run on LXC to allow for running docker

.forgejo/workflows/upgrade.yml

@@ -8,9 +8,7 @@ on:
 
 jobs:
   upgrade:
-    runs-on: docker
-    container:
-      image: 'docker.io/node:20-bookworm'
+    runs-on: lxc-bookworm
     steps:
       - name: cache S3 binaries
         id: S3
@@ -36,6 +34,7 @@ jobs:
       - run: |
           set -x
           forgejo-binary.sh ensure_user forgejo
+          apt-get -q install -y -qq build-essential
       - run: |
           script=$(pwd)/forgejo/upgrades/test-upgrade.sh
           $script run dependencies