refactor: internal package

internal/config/testdata/boxes.json

@@ -0,0 +1,5 @@
+{
+    "python": {
+        "image": "codapi/python"
+    }
+}

internal/config/testdata/commands.json

@@ -0,0 +1,25 @@
+{
+    "python": {
+        "run": {
+            "engine": "docker",
+            "entry": "main.py",
+            "steps": [
+                {
+                    "box": "python",
+                    "command": ["python", "main.py"]
+                }
+            ]
+        },
+        "test": {
+            "engine": "docker",
+            "entry": "test_main.py",
+            "steps": [
+                {
+                    "box": "python",
+                    "command": ["python", "-m", "unittest"],
+                    "noutput": 8192
+                }
+            ]
+        }
+    }
+}

internal/config/testdata/config.json

@@ -0,0 +1,10 @@
+{
+    "pool_size": 8,
+    "verbose": true,
+    "box": {
+        "memory": 64
+    },
+    "step": {
+        "user": "sandbox"
+    }
+}