test: Downgrade to podman 2.0.2 in Debian-testing

2.0.3 breaks API:

 - https://bugs.debian.org/966501
 - containers/podman#7078

test/vm.install

@@ -6,11 +6,14 @@ set -eu
 if [ -d /var/tmp/debian ]; then
     apt-get update
     eatmydata apt-get install -y cockpit-ws cockpit-system podman
+    # HACK: 2.0.3 breaks API: https://bugs.debian.org/966501; downgrade to 2.0.2
+    curl -O https://snapshot.debian.org/archive/debian/20200720T204543Z/pool/main/libp/libpod/podman_2.0.2%2Bdfsg1-3_amd64.deb
+    dpkg -i podman_2.0.2*.deb
 
     # HACK: starting podman.service complains about missing crun: https://bugs.debian.org/961016
     eatmydata apt-get install -y crun
 
-    # HACK: deb is not yet shipping the REST and user units: https://bugs.debian.org/966118
+    # HACK: 2.0.2 deb is not yet shipping the REST and user units: https://bugs.debian.org/966118
     (cd /lib/systemd/system
      curl -O https://raw.githubusercontent.com/containers/podman/master/contrib/systemd/system/podman.service
      curl -O https://raw.githubusercontent.com/containers/podman/master/contrib/systemd/system/podman.socket