diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 9d49130458..8d4eefdebf 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -29,7 +29,7 @@
     // Mount docker socket for docker builds
     "type=bind,source=/var/run/docker.sock,target=/var/run/docker.sock",
     // Mounts the github cli login details from the host machine to the container (~/.config/gh/hosts.yml)
-    "type=bind,source=${env:HOME}${env:USERPROFILE}/.config,target=/home/vscode/.config",
+    "type=bind,source=${env:HOME}${env:USERPROFILE}/.config,target=/home/vscode/.config"
   ],
   "remoteUser": "vscode",
   "containerEnv": {
@@ -277,6 +277,8 @@
         "ms-python.pylance",
         "hashicorp.terraform",
         "github.vscode-pull-request-github",
+        "gitHub.copilot",
+        "github.copilot-chat",
         "getporter.porter-vscode",
         "davidanson.vscode-markdownlint",
         "editorconfig.editorconfig",
@@ -291,5 +293,6 @@
     8000
   ],
   // Run commands after the container is created.
-  "postCreateCommand": "./.devcontainer/scripts/post-create.sh"
+  "postCreateCommand": "./.devcontainer/scripts/post-create.sh",
+  "initializeCommand": "mkdir -p $HOME/.azure $HOME/.config || true"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 929f97efc4..1f5501078f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,6 +54,7 @@ BUG FIXES:
 * Fix VM actions where Workspace shared storage doesn't allow shared key access ([#4222](https://github.com/microsoft/AzureTRE/issues/4222))
 * Fix public exposure in Guacamole service ([[#4199](https://github.com/microsoft/AzureTRE/issues/4199)])
 * Fix Azure ML network tags to use name rather than ID ([[#4151](https://github.com/microsoft/AzureTRE/issues/4151)])
+* Fix dev container build failure on missing mount directories, add copilot extensions, and CI fixes  ([#4290](https://github.com/microsoft/AzureTRE/pull/4290))
 
 COMPONENTS:
 
diff --git a/e2e_tests/config.py b/e2e_tests/config.py
index cd43a78181..31ccb34c37 100644
--- a/e2e_tests/config.py
+++ b/e2e_tests/config.py
@@ -1,11 +1,9 @@
+import warnings
 from starlette.config import Config
 
+warnings.filterwarnings("ignore", message="Config file '.env' not found.")
 
-try:
-    config = Config('.env')
-# Workaround needed until FastAPI uses Starlette >= 3.7.1
-except FileNotFoundError:
-    config = Config()
+config = Config('.env')
 
 # Resource Info
 RESOURCE_LOCATION: str = config("RESOURCE_LOCATION", default="")
diff --git a/e2e_tests/conftest.py b/e2e_tests/conftest.py
index 7195a14588..39589e1696 100644
--- a/e2e_tests/conftest.py
+++ b/e2e_tests/conftest.py
@@ -12,23 +12,13 @@
 
 
 LOGGER = logging.getLogger(__name__)
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 
 def pytest_addoption(parser):
     parser.addoption("--verify", action="store", default="true")
 
 
-@pytest.fixture(scope="session")
-def event_loop():
-    try:
-        loop = asyncio.get_running_loop()
-    except RuntimeError:
-        loop = asyncio.new_event_loop()
-    yield loop
-    loop.close()
-
-
 @pytest.fixture(scope="session")
 def verify(pytestconfig):
     if pytestconfig.getoption("verify").lower() == "true":
diff --git a/e2e_tests/pytest.ini b/e2e_tests/pytest.ini
index 72fe2d3414..3e3cf490e3 100644
--- a/e2e_tests/pytest.ini
+++ b/e2e_tests/pytest.ini
@@ -10,6 +10,7 @@ markers =
     workspace_services
 
 asyncio_mode = auto
+asyncio_default_fixture_loop_scope = session
 
 log_cli = 1
 log_cli_level = INFO
diff --git a/e2e_tests/test_airlock.py b/e2e_tests/test_airlock.py
index 43e2df71bb..051a5c9d81 100644
--- a/e2e_tests/test_airlock.py
+++ b/e2e_tests/test_airlock.py
@@ -14,7 +14,7 @@
 from helpers import get_admin_token
 
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 LOGGER = logging.getLogger(__name__)
 BLOB_FILE_PATH = "./test_airlock_sample.txt"
 BLOB_NAME = os.path.basename(BLOB_FILE_PATH)
diff --git a/e2e_tests/test_performance.py b/e2e_tests/test_performance.py
index 6c6d836d9d..f6e7637fe2 100644
--- a/e2e_tests/test_performance.py
+++ b/e2e_tests/test_performance.py
@@ -8,7 +8,7 @@
 
 from helpers import get_admin_token
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 
 @pytest.mark.performance
diff --git a/e2e_tests/test_provisioned_health_api.py b/e2e_tests/test_provisioned_health_api.py
index 01c3cbeecc..92636d12dc 100644
--- a/e2e_tests/test_provisioned_health_api.py
+++ b/e2e_tests/test_provisioned_health_api.py
@@ -5,7 +5,7 @@
 from resources import strings
 
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 
 @pytest.mark.smoke
diff --git a/e2e_tests/test_ui.py b/e2e_tests/test_ui.py
index 6e34da518b..8d71827fdb 100644
--- a/e2e_tests/test_ui.py
+++ b/e2e_tests/test_ui.py
@@ -4,7 +4,7 @@
 import config
 
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 
 @pytest.mark.smoke
diff --git a/e2e_tests/test_workspace_service_templates.py b/e2e_tests/test_workspace_service_templates.py
index 34545d9af1..8ea70e6368 100644
--- a/e2e_tests/test_workspace_service_templates.py
+++ b/e2e_tests/test_workspace_service_templates.py
@@ -8,7 +8,7 @@
 from resources import strings
 from helpers import get_admin_token
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 workspace_service_templates = [
     (strings.AZUREML_SERVICE),
diff --git a/e2e_tests/test_workspace_services.py b/e2e_tests/test_workspace_services.py
index cd48910817..3013fef370 100644
--- a/e2e_tests/test_workspace_services.py
+++ b/e2e_tests/test_workspace_services.py
@@ -5,7 +5,7 @@
 from resources.resource import get_resource, post_resource
 from resources import strings
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 workspace_services = [
     strings.AZUREML_SERVICE,
diff --git a/e2e_tests/test_workspace_templates.py b/e2e_tests/test_workspace_templates.py
index d0ccb1f64e..1fed11daaa 100644
--- a/e2e_tests/test_workspace_templates.py
+++ b/e2e_tests/test_workspace_templates.py
@@ -11,7 +11,7 @@
 from helpers import get_admin_token
 
 
-pytestmark = pytest.mark.asyncio
+pytestmark = pytest.mark.asyncio(loop_scope="session")
 
 
 workspace_templates = [
diff --git a/templates/workspaces/airlock-import-review/porter.yaml b/templates/workspaces/airlock-import-review/porter.yaml
index 7e4330cd30..56f90dbc70 100644
--- a/templates/workspaces/airlock-import-review/porter.yaml
+++ b/templates/workspaces/airlock-import-review/porter.yaml
@@ -1,7 +1,7 @@
 ---
 schemaVersion: 1.0.0
 name: tre-workspace-airlock-import-review
-version: 0.14.1
+version: 0.14.2
 description: "A workspace to do Airlock Data Import Reviews for Azure TRE"
 dockerfile: Dockerfile.tmpl
 registry: azuretre
diff --git a/templates/workspaces/airlock-import-review/template_schema.json b/templates/workspaces/airlock-import-review/template_schema.json
index e05a0d87e7..180e360abc 100644
--- a/templates/workspaces/airlock-import-review/template_schema.json
+++ b/templates/workspaces/airlock-import-review/template_schema.json
@@ -16,6 +16,7 @@
       "description": "The SKU that will be used when deploying an Azure App Service Plan.",
       "default": "P1v3",
       "enum": [
+        "P0v3",
         "P1v3",
         "P1v2",
         "S1"
diff --git a/templates/workspaces/base/porter.yaml b/templates/workspaces/base/porter.yaml
index 89be17e3de..a7e09fa692 100644
--- a/templates/workspaces/base/porter.yaml
+++ b/templates/workspaces/base/porter.yaml
@@ -1,7 +1,7 @@
 ---
 schemaVersion: 1.0.0
 name: tre-workspace-base
-version: 1.9.1
+version: 1.9.2
 description: "A base Azure TRE workspace"
 dockerfile: Dockerfile.tmpl
 registry: azuretre
diff --git a/templates/workspaces/base/template_schema.json b/templates/workspaces/base/template_schema.json
index 77049d7f1c..b456b5f044 100644
--- a/templates/workspaces/base/template_schema.json
+++ b/templates/workspaces/base/template_schema.json
@@ -28,6 +28,7 @@
       "description": "The SKU that will be used when deploying an Azure App Service Plan.",
       "default": "P1v3",
       "enum": [
+        "P0v3",
         "P1v3",
         "P1v2",
         "S1"
diff --git a/templates/workspaces/unrestricted/porter.yaml b/templates/workspaces/unrestricted/porter.yaml
index 5d1cc8cfa1..b8bd2becae 100644
--- a/templates/workspaces/unrestricted/porter.yaml
+++ b/templates/workspaces/unrestricted/porter.yaml
@@ -1,7 +1,7 @@
 ---
 schemaVersion: 1.0.0
 name: tre-workspace-unrestricted
-version: 0.13.1
+version: 0.13.2
 description: "A base Azure TRE workspace"
 dockerfile: Dockerfile.tmpl
 registry: azuretre
diff --git a/templates/workspaces/unrestricted/template_schema.json b/templates/workspaces/unrestricted/template_schema.json
index 3fbaa16a3a..f9c8a807f1 100644
--- a/templates/workspaces/unrestricted/template_schema.json
+++ b/templates/workspaces/unrestricted/template_schema.json
@@ -28,6 +28,7 @@
       "description": "The SKU that will be used when deploying an Azure App Service Plan.",
       "default": "P1v3",
       "enum": [
+        "P0v3",
         "P1v3",
         "P1v2",
         "S1"