Forward the dockerd socket ourself.

Using the forward script. It turns out to be much more reliable (and
faster).

deploy

@@ -12,9 +12,12 @@ _check() {
 }
 
 _deploy() {
-    echo "Deploying to $1" >&2
-    export DOCKER_HOST="ssh://$1"
-    export RUNNER_NAME="$1"
+    host="$1"
+    echo "Deploying to $host" >&2
+    localsocket="$HOME/.ssh/docker_$host.sock"
+    forward "$host" "$localsocket:/var/run/docker.sock"
+    export DOCKER_HOST="unix://$localsocket"
+    export RUNNER_NAME="$host"
     until _docker_compose up --detach --remove-orphans ; do true; done
     # shellcheck disable=SC2034
     for i in $(seq 12)