vm-img: update definitions of images

component/vm-img/debian.cfg

@@ -22,7 +22,7 @@ dist = ${vm-debian:dists}
 [vm-debian]
 recipe = slapos.recipe.build:vm.install-debian
 environment = vm-install-environment
-dists = debian-stretch
+dists = debian-stable
 size = 1Gi
 late-command =
 # rdnssd causes too much trouble with recent QEMU, because the latter acts as
@@ -60,23 +60,33 @@ preseed.apt-setup/enable-source-repositories = false
 preseed.recommends = false
 preseed.tasks =
 
+[debian-stable]
+x86_64.iso = debian-amd64-netinst.iso
+x86_64.kernel = install.amd/vmlinuz
+x86_64.initrd = install.amd/initrd.gz
+
+[debian-testing]
+<= debian-stable
+x86_64.iso = debian-amd64-testing-netinst.iso
+
 [debian-squeeze]
-<= debian-stretch
+<= debian-stable
 x86_64.iso = debian-amd64-squeeze-netinst.iso
 
 [debian-wheezy]
-<= debian-stretch
+<= debian-stable
 x86_64.iso = debian-amd64-wheezy-netinst.iso
 
 [debian-jessie]
-<= debian-stretch
+<= debian-stable
 x86_64.iso = debian-amd64-jessie-netinst.iso
 
 [debian-stretch]
-x86_64.iso = debian-amd64-netinst.iso
-x86_64.kernel = install.amd/vmlinuz
-x86_64.initrd = install.amd/initrd.gz
+<= debian-stable
+x86_64.iso = debian-amd64-stretch-netinst.iso
 
 [debian-buster]
-<= debian-stretch
-x86_64.iso = debian-amd64-testing-netinst.iso
+<= debian-stable
+
+[debian-bullseye]
+<= debian-testing