ci: remove unused secrets from dryrun steps

.drone.yml

@@ -32,11 +32,7 @@ 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/**
@@ -195,6 +191,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 1db64b7079ec7e54a4fb59b0a7e35e5566c5a52098668c2feea4373827ec341b
+hmac: 7a497e0ef1d1e2a1a92c18967eaa22e3f9733f66d2a7b24c63568c2a7be344e1
 
 ...