Optimize devcontainer build.

Author: guzman-raphael

.devcontainer/Dockerfile

@@ -1,9 +1,11 @@
 # Note: You can use any Debian/Ubuntu based image you want. 
-FROM mcr.microsoft.com/devcontainers/base:bullseye
+FROM mcr.microsoft.com/devcontainers/python:3.7-bullseye
 
 RUN \
     apt update && \
-    apt-get install bash-completion graphviz default-mysql-client -y
+    apt-get install bash-completion graphviz default-mysql-client -y && \
+    pip install flake8 black faker ipykernel nose nose-cov datajoint && \
+    pip uninstall datajoint -y
 
 ENV DJ_HOST fakeservices.datajoint.io
 ENV DJ_USER root

.devcontainer/devcontainer.json

@@ -13,12 +13,9 @@
 		"ghcr.io/devcontainers/features/docker-in-docker:2": {},
 		"ghcr.io/devcontainers/features/git:1": {},
 		"ghcr.io/eitsupi/devcontainer-features/jq-likes:1": {},
-		"ghcr.io/guiyomh/features/vim:0": {},
-		"ghcr.io/devcontainers/features/python:1": {
-			"version": "3.7"
-		}
+		"ghcr.io/guiyomh/features/vim:0": {}
 	},
-	"postCreateCommand": "pip install flake8 black faker ipykernel nose nose-cov && pip install -e . && MYSQL_VER=5.7 MINIO_VER=RELEASE.2022-08-11T04-37-28Z docker compose -f local-docker-compose.yml up --build -d",
+	"onCreateCommand": "pip install -e . && MYSQL_VER=5.7 MINIO_VER=RELEASE.2022-08-11T04-37-28Z docker compose -f local-docker-compose.yml up --build -d",
 	"customizations": {
 		"vscode": {
 			"extensions": [