CI: Merge categories in debian/12-x86_64.dockerfile

cpio needs to be in Tools (general) now that it's used by the general build
script.  Merge the rest of the test phase jobs into one group, to avoid being
overly fine-grain.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

automation/build/debian/12-x86_64.dockerfile

@@ -23,6 +23,7 @@ RUN <<EOF
 
         # Tools (general)
         ca-certificates
+        cpio
         git-core
         pkg-config
         wget
@@ -52,19 +53,14 @@ RUN <<EOF
         ocaml-nox
         ocaml-findlib
 
-        # for test phase, qemu-smoke-* jobs
+        # for test phase, qemu-* jobs
+        busybox-static
         expect
+        ovmf
         qemu-system-x86
 
         # for build-each-commit-gcc
         ccache
-
-        # for qemu-alpine-x86_64-gcc
-        busybox-static
-        cpio
-
-        # For *-efi jobs
-        ovmf
     )
 
     apt-get -y --no-install-recommends install "${DEPS[@]}"