Run the integration tests in the CI pipeline BUT without API keys (#3359)

* integration tests in ci pipeline

* Update CONTRIBUTING.md

Co-authored-by: Reinier van der Leer <github@pwuts.nl>

---------

Co-authored-by: Reinier van der Leer <github@pwuts.nl>

tests/utils.py

@@ -1,17 +1,32 @@
 import functools
 import os
+from contextlib import contextmanager
 
 import pytest
 
+from autogpt.config import Config
+
+
+@contextmanager
+def dummy_openai_api_key():
+    # even when we record the VCR cassettes, openAI wants an API key
+    config = Config()
+    original_api_key = config.openai_api_key
+    config.set_openai_api_key("sk-dummy")
+
+    try:
+        yield
+    finally:
+        config.set_openai_api_key(original_api_key)
+
 
 def requires_api_key(env_var):
     def decorator(func):
         @functools.wraps(func)
         def wrapper(*args, **kwargs):
-            if not os.environ.get(env_var):
-                pytest.skip(
-                    f"Environment variable '{env_var}' is not set, skipping the test."
-                )
+            if not os.environ.get(env_var) and env_var == "OPENAI_API_KEY":
+                with dummy_openai_api_key():
+                    return func(*args, **kwargs)
             else:
                 return func(*args, **kwargs)