Added custom image env

Author: Gavin Aguiar

.github/workflows/ci_docker_ded_workflow.yml

@@ -1,6 +1,5 @@
 # This workflow will run all tests in endtoend/tests in a docker container using the latest dedicated image
 
-
 name: CI Docker Dedicated tests
 
 on:

tests/utils/testutils_docker.py

@@ -24,6 +24,7 @@
 _MESH_IMAGE_REPO = "mcr.microsoft.com/azure-functions/mesh"
 _IMAGE_URL = "https://mcr.microsoft.com/v2/azure-functions/python/tags/list"
 _IMAGE_REPO = "mcr.microsoft.com/azure-functions/python"
+_CUSTOM_IMAGE = os.getenv("IMAGE_NAME")
 
 
 @dataclass
@@ -116,7 +117,10 @@ def create_container(self, image_repo: str, image_url: str,
 
         configs.env.update(env)
 
-        image = self.find_latest_image(image_repo, image_url)
+        if _CUSTOM_IMAGE:
+            image = _CUSTOM_IMAGE
+        else:
+            image = self.find_latest_image(image_repo, image_url)
 
         container_worker_path = (
             f"/azure-functions-host/workers/python/{_python_version}/"