mkosi: Use build image prepare scripts for tools tree as well

Instead of listing dependencies manually for the default tools tree,
let's reuse the prepare scripts from the build image. To make this work,
the sync script has to be configured for the tools tree as well so that
it's invoked both when building the tools tree and for the regular image,
otherwise, when doing the first build in a fresh checkout, the sync script
won't have executed yet as sync scripts for the regular images are executed
after building the default tools tree.

.github/workflows/mkosi.yml

@@ -191,10 +191,14 @@ jobs:
 
       - name: Configure meson
         run: |
+          # /usr/sbin/bpftool is completely broken inside containers on Ubuntu which makes meson blow up so
+          # disable the bpf-framework stuff to avoid the issue.
+          # TODO: Drop when we move off Ubuntu Noble as this will be fixed in the next Ubuntu LTS release.
           sudo mkosi sandbox -- \
             meson setup \
             --buildtype=debugoptimized \
             -Dintegration-tests=true \
+            -Dbpf-framework=disabled \
             build
 
       - name: Build image