ci: remove unused secrets from dryrun steps

.drone.yml

@@ -39,11 +39,7 @@ steps:
     settings:
       dockerfile: Dockerfile
       dry_run: true
-      password:
-        from_secret: docker_password
       repo: thegeeklab/${DRONE_REPO_NAME}
-      username:
-        from_secret: docker_username
     when:
       ref:
         - refs/pull/**
@@ -204,6 +200,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: f23406441a2cf3872a1990a14e60a888b375ef31f75ea455fe4d2aa5dfe850be
+hmac: 9bb496b4d68fd0b2f3b93e595e9541c7098a10ce45495889b7eb77e6fe051f3e
 
 ...