Use spritsail/drone-test CI step

.drone.yml

@@ -5,20 +5,15 @@ pipeline:
     repo: plex-dev
 
   test:
-    image: docker
+    image: spritsail/docker-test
     volumes: [ '/var/run/docker.sock:/var/run/docker.sock' ]
-    commands:
-      - apk add --no-cache curl xmlstarlet grep
-      - export CUR_VERSION="$(docker inspect -f '{{ index .Config.Labels "io.spritsail.version.plex" }}' plex-dev | cut -d- -f1)"
-      - CON_NAME=$(docker run --rm -d plex-dev)
-      - timeout -t 15 docker logs $$CON_NAME &
-      - sleep 10  # Wait for plex to start!
-      - curl -sSL  --retry-max-time 30 --max-time 5 --retry 10 --retry-delay 5 --retry-connrefused
-          $(docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $$CON_NAME):32400/identity
-            | tee /dev/stderr
-            | xmlstarlet sel -t -v "/MediaContainer/@version"
-            | grep -qw $CUR_VERSION
-      - docker kill $$CON_NAME
+    repo: plex-dev
+    curl: ':32400/identity'
+    delay: 5
+    retry: 10
+    pipe: |
+      xmlstarlet sel -t -v "/MediaContainer/@version" |
+      grep -qw "$(label io.spritsail.version.plex | cut -d- -f1)"
 
   publish:
     image: spritsail/docker-publish