Dockerfile updates: (#2556)

- New Dockerfile for running samples
- New Dockerfile for K/N distribution
- Samples: buildSh should finilize buildAllSamples task to avoid concurrency issues
- Samples: Build avoidance for html5Canvas

samples/build.gradle

@@ -61,8 +61,8 @@ task buildSamplesWithPlatformLibs() {
 }
 
 task buildAllSamples() {
-    dependsOn buildSh
     subprojects.each {
         dependsOn("${it.path}:assemble")
     }
+    finalizedBy buildSh
 }

samples/html5Canvas/build.gradle

@@ -42,7 +42,13 @@ task jsinterop(type: Exec) {
     def ext = MPPTools.isWindows() ? '.bat' : ''
     def distributionPath = project.properties['org.jetbrains.kotlin.native.home'] as String
     if (distributionPath != null) {
-        commandLine Paths.get(file(distributionPath).path, 'bin', "jsinterop$ext").toString(),
+        def jsinteropCommand = Paths.get(file(distributionPath).path, 'bin', "jsinterop$ext").toString()
+
+        inputs.property('jsinteropCommand', jsinteropCommand)
+        inputs.property('jsinteropPackageName', packageName)
+        outputs.file(jsinteropKlibFileName)
+
+        commandLine jsinteropCommand,
                 '-pkg', packageName,
                 '-o', jsinteropKlibFileName,
                 '-target', 'wasm32'