feat(docker): add Docker test file support and runtime adapter

test/test.example.latest.docker.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+# Sample Docker test file
+# This file demonstrates the naming pattern: test.{baseName}.{variant}.docker.sh
+# The variant "latest" maps to the Dockerfile in the project root
+
+echo "TAP version 13"
+echo "1..2"
+echo "ok 1 - Sample Docker test passes"
+echo "ok 2 - Docker environment is working"