check right thing for empty

bin/core/src/api/execute/build.rs

@@ -264,7 +264,7 @@ impl Resolve<RunBuild, (User, Update)> for State {
             .join("\n"),
         );
       }
-      if !secret_replacers.is_empty() {
+      if !secret_replacers_for_log.is_empty() {
         update.push_simple_log(
           "interpolate core secrets",
           secret_replacers_for_log

client/core/rs/src/entities/build.rs

@@ -161,10 +161,10 @@ pub struct BuildConfig {
   /// These values remain hidden in the final image by using
   /// docker secret mounts. See `<https://docs.docker.com/build/building/secrets>`.
   ///
-  /// To use the values, add commands like this in the Dockerfile:
+  /// The values can be used in RUN commands:
   /// ```
   /// RUN --mount=type=secret,id=SECRET_KEY \
-  ///   SECRET_VALUE=$(cat /run/secrets/SECRET_KEY) ...
+  ///   SECRET_KEY=$(cat /run/secrets/SECRET_KEY) ...
   /// ```
   #[serde(
     default,