Fix loading of docker-compose.override files

Override files are not automatically loaded when running with `-f`, so
we need to specify them manually.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 Note: Breaking changes between versions are indicated by "💥".
 
+## Unreleased
+
+- [Bugfix] Make sure `docker-compose.override.yml` are loaded in dev and local contexts
+
 ## 3.11.1 (2020-01-16)
 
 - [Feature] Add `config render` command

tutor/commands/dev.py

@@ -1,3 +1,5 @@
+import os
+
 import click
 
 from . import compose
@@ -10,14 +12,22 @@ from .. import utils
 class DevContext(Context):
     @staticmethod
     def docker_compose(root, config, *command):
-        return utils.docker_compose(
+        args = [
             "-f",
             tutor_env.pathjoin(root, "local", "docker-compose.yml"),
+        ]
+        override_path = tutor_env.pathjoin(root, "local", "docker-compose.override.yml")
+        if os.path.exists(override_path):
+            args += ["-f", override_path]
+        args += [
             "-f",
             tutor_env.pathjoin(root, "dev", "docker-compose.yml"),
-            "--project-name",
-            config["DEV_PROJECT_NAME"],
-            *command,
+        ]
+        override_path = tutor_env.pathjoin(root, "dev", "docker-compose.override.yml")
+        if os.path.exists(override_path):
+            args += ["-f", override_path]
+        return utils.docker_compose(
+            *args, "--project-name", config["DEV_PROJECT_NAME"], *command,
         )
 
 

tutor/commands/local.py

@@ -1,3 +1,4 @@
+import os
 from textwrap import indent
 
 import click
@@ -15,9 +16,14 @@ from .. import utils
 class LocalContext(Context):
     @staticmethod
     def docker_compose(root, config, *command):
+        args = []
+        override_path = tutor_env.pathjoin(root, "local", "docker-compose.override.yml")
+        if os.path.exists(override_path):
+            args += ["-f", override_path]
         return utils.docker_compose(
             "-f",
             tutor_env.pathjoin(root, "local", "docker-compose.yml"),
+            *args,
             "--project-name",
             config["LOCAL_PROJECT_NAME"],
             *command