tests: Properly set up ssh access

Allow the unprivileged `runtest` account to ssh to localhost as root.

tests/verify.sh

@@ -26,6 +26,10 @@ fi
 # create user account for running the test
 if ! id runtest 2>/dev/null; then
     useradd -c 'Test runner' runtest
+    # allow test to set up things on the machine
+    mkdir -p /root/.ssh
+    curl https://raw.githubusercontent.com/cockpit-project/bots/master/machine/identity.pub  >> /root/.ssh/authorized_keys
+    chmod 600 /root/.ssh/authorized_keys
 fi
 chown -R runtest "$SOURCE"