diff --git a/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowJob.scala b/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowJob.scala
index 8901148b..4d6173ec 100644
--- a/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowJob.scala
+++ b/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowJob.scala
@@ -60,7 +60,9 @@ sealed abstract class WorkflowJob {
   def withTimeoutMinutes(timeoutMinutes: Option[Int]): WorkflowJob
 
   def updatedEnv(name: String, value: String): WorkflowJob
-  def appendSteps(steps: List[WorkflowStep]): WorkflowJob
+  def concatEnv(envs: TraversableOnce[(String, String)]): WorkflowJob
+  def appendedStep(step: WorkflowStep): WorkflowJob
+  def concatStep(suffixSteps: TraversableOnce[WorkflowStep]): WorkflowJob
 }
 
 object WorkflowJob {
@@ -153,8 +155,10 @@ object WorkflowJob {
     override def withConcurrency(concurrency: Option[Concurrency]): WorkflowJob = copy(concurrency = concurrency)
     override def withTimeoutMinutes(timeoutMinutes: Option[Int]): WorkflowJob = copy(timeoutMinutes = timeoutMinutes)
 
-    def updatedEnv(name: String, value: String): WorkflowJob = withEnv(env.updated(name, value))
-    def appendSteps(steps: List[WorkflowStep]): WorkflowJob = withSteps(this.steps ++ steps)
+    def updatedEnv(name: String, value: String): WorkflowJob = copy(env = env.updated(name, value))
+    def concatEnv(envs: TraversableOnce[(String, String)]): WorkflowJob = copy(env = this.env ++ envs)
+    def appendedStep(step: WorkflowStep): WorkflowJob = copy(steps = this.steps :+ step)
+    def concatStep(suffixSteps: TraversableOnce[WorkflowStep]): WorkflowJob = copy(steps = this.steps ++ suffixSteps)
     // scalafmt: { maxColumn = 96 }
 
     override def productPrefix = "WorkflowJob"
diff --git a/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowStep.scala b/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowStep.scala
index 65a787c0..9880f66d 100644
--- a/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowStep.scala
+++ b/github-actions/src/main/scala/org/typelevel/sbt/gha/WorkflowStep.scala
@@ -30,7 +30,7 @@ sealed abstract class WorkflowStep extends Product with Serializable {
   def withTimeoutMinutes(minutes: Option[Int]): WorkflowStep
 
   def updatedEnv(name: String, value: String): WorkflowStep
-  def addEnv(env: Map[String, String]): WorkflowStep
+  def concatEnv(env: TraversableOnce[(String, String)]): WorkflowStep
 }
 
 object WorkflowStep {
@@ -127,9 +127,9 @@ object WorkflowStep {
     def withWorkingDirectory(workingDirectory: Option[String]): Run
 
     def updatedEnv(name: String, value: String): Run
-    def addEnv(env: Map[String, String]): Run
+    def concatEnv(env: TraversableOnce[(String, String)]): Run
     def updatedParams(name: String, value: String): Run
-    def addParams(params: Map[String, String]): Run
+    def concatParams(params: TraversableOnce[(String, String)]): Run
   }
 
   object Run {
@@ -167,9 +167,9 @@ object WorkflowStep {
       def withWorkingDirectory(workingDirectory: Option[String]) = copy(workingDirectory = workingDirectory)
 
       def updatedEnv(name: String, value: String) = copy(env = this.env.updated(name, value))
-      def addEnv(env: Map[String, String]) = copy(env = this.env ++ env)
+      def concatEnv(env: TraversableOnce[(String, String)]) = copy(env = this.env ++ env)
       def updatedParams(name: String, value: String) = copy(params = this.params.updated(name, value))
-      def addParams(params: Map[String, String]) = copy(params = this.params ++ params)
+      def concatParams(params: TraversableOnce[(String, String)]) = copy(params = this.params ++ params)
       // scalafmt: { maxColumn = 96 }
     }
   }
@@ -184,9 +184,9 @@ object WorkflowStep {
     def withPreamble(preamble: Boolean): Sbt
 
     def updatedEnv(name: String, value: String): Sbt
-    def addEnv(env: Map[String, String]): Sbt
+    def concatEnv(env: TraversableOnce[(String, String)]): Sbt
     def updatedParams(name: String, value: String): Sbt
-    def addParams(params: Map[String, String]): Sbt
+    def concatParams(params: TraversableOnce[(String, String)]): Sbt
   }
 
   object Sbt {
@@ -224,9 +224,9 @@ object WorkflowStep {
       def withPreamble(preamble: Boolean) = copy(preamble = preamble)
 
       def updatedEnv(name: String, value: String) = copy(env = this.env.updated(name, value))
-      def addEnv(env: Map[String, String]) = copy(env = this.env ++ env)
+      def concatEnv(env: TraversableOnce[(String, String)]) = copy(env = this.env ++ env)
       def updatedParams(name: String, value: String) = copy(params = params.updated(name, value))
-      def addParams(params: Map[String, String]) = copy(params = this.params ++ params)
+      def concatParams(params: TraversableOnce[(String, String)]) = copy(params = this.params ++ params)
       // scalafmt: { maxColumn = 96 }
     }
   }
@@ -239,9 +239,9 @@ object WorkflowStep {
     def withParams(params: Map[String, String]): Use
 
     def updatedEnv(name: String, value: String): Use
-    def addEnv(env: Map[String, String]): Use
+    def concatEnv(env: TraversableOnce[(String, String)]): Use
     def updatedParams(name: String, value: String): Use
-    def addParams(params: Map[String, String]): Use
+    def concatParams(params: TraversableOnce[(String, String)]): Use
   }
 
   object Use {
@@ -277,9 +277,9 @@ object WorkflowStep {
       def withParams(params: Map[String, String]) = copy(params = params)
 
       def updatedEnv(name: String, value: String) = copy(env = this.env.updated(name, value))
-      def addEnv(env: Map[String, String]) = copy(env = this.env ++ env)
+      def concatEnv(env: TraversableOnce[(String, String)]) = copy(env = this.env ++ env)
       def updatedParams(name: String, value: String) = copy(params = params.updated(name, value))
-      def addParams(params: Map[String, String]) = copy(params = this.params ++ params)
+      def concatParams(params: TraversableOnce[(String, String)]) = copy(params = this.params ++ params)
       // scalafmt: { maxColumn = 96 }
     }
   }