.scala-steward.conf

@@ -0,0 +1,8 @@
+postUpdateHooks = [
+  {
+    command = ["sbt", "updateYml"],
+    commitMessage = "Regenerated action.yml",
+    groupId = "org.scala-sbt",
+    artifactId = "sbt"
+  }
+]

action.yml

@@ -4,7 +4,7 @@ inputs:
   sbt-runner-version:
     description: "The runner version (The actual version is controlled via project/build.properties)"
     required: true
-    default: 1.10.7
+    default: 1.10.10
 runs:
   using: "composite"
   steps:

build.sbt

@@ -0,0 +1,14 @@
+import java.util.regex.Pattern
+
+TaskKey[Unit]("updateYml") := {
+
+  val location = baseDirectory.value / "action.yml"
+  val oldContent = IO.read(location)
+
+  val matcher = Pattern.compile("default: (.+)$", Pattern.MULTILINE).matcher(oldContent)
+  if (matcher.find) {
+    val oldVersion = matcher.group(1)
+    val updatedContent = oldContent.replace(s"default: $oldVersion", s"default: ${sbtVersion.value}")
+    IO.write(location, updatedContent)
+  }
+}

project/build.properties

@@ -1 +1 @@
-sbt.version=1.10.6
+sbt.version=1.10.10