restore using subprocess instead of docker

- Github Actions doesn't allow use of http+docker URL scheme

pyproject.toml

@@ -38,7 +38,6 @@ dependencies = [
   "moto[all]~=5.0.6",
   "httpx~=0.27.0",
   "respx~=0.21.1",
-  "docker~=7.0.0",
   # TODO: remove cryptography pin when this issue resolved:
   # cryptography/hazmat/bindings/_rust.abi3.so: cannot open shared object file: No such file or directory
   "cryptography<35.0.0",

tests/test_lambda.py

@@ -1,10 +1,10 @@
 import json
 import os
+import subprocess
 from importlib.metadata import version
 from uuid import uuid4
 
 import boto3
-import docker
 import pytest
 import respx
 from botocore.exceptions import ClientError
@@ -85,18 +85,18 @@ def build_mock_lambda_package():
         "Running build_lambda_script: %s\nThis may take some time...",
         build_lambda_script,
     )
-    client = docker.from_env()
-    client.containers.run(
-        "mlupin/docker-lambda:python3.9-build",
-        "./scripts/build_mock_lambda_package.sh",
-        auto_remove=True,
-        volumes={
-            f"{os.path.normpath(os.path.join(os.path.dirname(__file__), '..'))}": {
-                "bind": "/var/task",
-                "mode": "rw",
-            }
-        },
+    proc = subprocess.run(
+        [
+            "docker",
+            "run",
+            "--rm",
+            "-v",
+            f"{os.path.normpath(os.path.join(os.path.dirname(__file__), '..'))}:/var/task",
+            "mlupin/docker-lambda:python3.9-build",
+            "./scripts/build_mock_lambda_package.sh",
+        ]
     )
+    assert proc.returncode == 0
 
 
 def get_lambda_code():