Enable to pass custom docker-cmd to execute application in docker (#1980)

Author: lwronski

modules/cli/src/main/scala/scala/cli/commands/package0/Package.scala

@@ -626,10 +626,12 @@ object Package extends ScalaCommand[PackageOptions] with BuildCommandHelpers {
       sys.exit(1)
     }
 
-    val exec = build.options.platform.value match {
-      case Platform.JVM    => Some("sh")
-      case Platform.JS     => Some("node")
-      case Platform.Native => None
+    val exec = packageOptions.dockerOptions.cmd.orElse {
+      build.options.platform.value match {
+        case Platform.JVM    => Some("sh")
+        case Platform.JS     => Some("node")
+        case Platform.Native => None
+      }
     }
     val from = packageOptions.dockerOptions.from.getOrElse {
       build.options.platform.value match {

modules/cli/src/main/scala/scala/cli/commands/package0/PackageOptions.scala

@@ -213,6 +213,7 @@ final case class PackageOptions(
             imageRegistry = packager.dockerImageRegistry,
             imageRepository = packager.dockerImageRepository,
             imageTag = packager.dockerImageTag,
+            cmd = packager.dockerCmd,
             isDockerEnabled = Some(docker)
           ),
           nativeImageOptions = NativeImageOptions(

modules/cli/src/main/scala/scala/cli/commands/package0/PackagerOptions.scala

@@ -132,6 +132,12 @@ final case class PackagerOptions(
   )
   @Tag(tags.restricted)
   dockerImageTag: Option[String] = None,
+  @Group(HelpGroup.Docker.toString)
+  @HelpMessage(
+    "Allows to override the executable used to run the application in docker, otherwise it defaults to sh for the JVM platform and node for the JS platform"
+  )
+  @Tag(tags.restricted)
+  dockerCmd: Option[String] = None,
 
   @Group(HelpGroup.NativeImage.toString)
   @HelpMessage(s"GraalVM Java major version to use to build GraalVM native images (${Constants.defaultGraalVMJavaVersion} by default)")

modules/directives/src/main/scala/scala/build/preprocessing/directives/Packaging.scala

@@ -57,7 +57,8 @@ final case class Packaging(
   dockerFrom: Option[String] = None,
   dockerImageTag: Option[String] = None,
   dockerImageRegistry: Option[String] = None,
-  dockerImageRepository: Option[String] = None
+  dockerImageRepository: Option[String] = None,
+  dockerCmd: Option[String] = None
 ) extends HasBuildOptions {
   // format: on
   def buildOptions: Either[BuildException, BuildOptions] = either {
@@ -108,7 +109,8 @@ final case class Packaging(
             from = dockerFrom,
             imageRegistry = dockerImageRegistry,
             imageRepository = dockerImageRepository,
-            imageTag = dockerImageTag
+            imageTag = dockerImageTag,
+            cmd = dockerCmd
           ),
           nativeImageOptions = NativeImageOptions(
             graalvmArgs = graalvmArgs

modules/options/src/main/scala/scala/build/options/packaging/DockerOptions.scala

@@ -7,6 +7,7 @@ final case class DockerOptions(
   imageRegistry: Option[String] = None,
   imageRepository: Option[String] = None,
   imageTag: Option[String] = None,
+  cmd: Option[String] = None,
   isDockerEnabled: Option[Boolean] = None
 )
 

website/docs/reference/cli-options.md

@@ -853,6 +853,10 @@ The image repository
 
 The image tag; the default tag is `latest`
 
+### `--docker-cmd`
+
+Allows to override the executable used to run the application in docker, otherwise it defaults to sh for the JVM platform and node for the JS platform
+
 ### `--graalvm-java-version`
 
 GraalVM Java major version to use to build GraalVM native images (17 by default)