CI: try docker sock as volume

.drone.yml

@@ -5,6 +5,9 @@ name: default
 steps:
   - name: deploy
     image: docker:dind
+    volumes:
+      - name: docker
+        path: /var/run/docker.sock
     commands:
     - apk add --upgrade npm bash findutils rsync sed
     - WORKDIR="/var/docker-web/apps/$DRONE_REPO_NAME"
@@ -14,3 +17,8 @@ steps:
     - cd $WORKDIR
     - npm ci
     - bash /var/docker-web/src/cli.sh up $DRONE_REPO_NAME
+
+volumes:
+  - name: docker
+    host:
+      path: /var/run/docker.sock