ci: remove unused secrets from dryrun steps

.drone.yml

@@ -34,11 +34,7 @@ steps:
         - BUILD_VERSION=${DRONE_TAG%-*}
       dockerfile: Dockerfile
       dry_run: true
-      password:
-        from_secret: docker_password
       repo: thegeeklab/${DRONE_REPO_NAME}
-      username:
-        from_secret: docker_username
     when:
       ref:
         - refs/pull/**
@@ -201,6 +197,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 3d3a49cd900fe822c6568d4f2f2e6e9d628ddf2aca147079658b117c8de92c45
+hmac: de113d701dc404f63418de7473c636cc68cc7d42b9c258c3ac3698b83d84c9e2
 
 ...