Add volume

Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>

.drone.jsonnet

@@ -43,6 +43,10 @@ local check_steps() = [
       name: 'wait-for-docker',
       image: 'img.kie.rs/jjkiers/rust-dind-cross:1.62-slim',
       commands: ['while ! docker image ls; do sleep 1; done'],
+      volumes: [{
+        name: 'dockersock',
+        path: '/var/run',
+      }],
     }]
     + check_steps() +
     [