dev: test devcontainers

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

.devcontainer/Dockerfile

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+FROM ghcr.io/goauthentik/server:latest
+
+USER root
+
+RUN pip install --no-cache-dir -r /requirements-dev.txt

.devcontainer/devcontainer.json

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+{
+    "name": "authentik",
+    "dockerComposeFile": "docker-compose.yml",
+    "service": "app",
+    "workspaceFolder": "/authentik",
+    "features": {
+        "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {},
+        "ghcr.io/devcontainers/features/go:1": {},
+        "ghcr.io/devcontainers/features/node:1": {}
+    },
+    "forwardPorts": [9000],
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "EditorConfig.EditorConfig",
+                "bashmish.es6-string-css",
+                "bpruitt-goddard.mermaid-markdown-syntax-highlighting",
+                "dbaeumer.vscode-eslint",
+                "esbenp.prettier-vscode",
+                "golang.go",
+                "Gruntfuggly.todo-tree",
+                "mechatroner.rainbow-csv",
+                "ms-python.black-formatter",
+                "ms-python.isort",
+                "ms-python.pylint",
+                "ms-python.python",
+                "ms-python.vscode-pylance",
+                "redhat.vscode-yaml",
+                "Tobermory.es6-string-html",
+                "unifiedjs.vscode-mdx"
+            ]
+        }
+    }
+}

.devcontainer/docker-compose.yml

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+version: '3.8'
+
+services:
+  app:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile
+    volumes:
+      - ../:/authentik:cached
+    command: debug
+  db:
+    image: docker.io/library/postgres:15
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    network_mode: service:app
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_DB: postgres
+      POSTGRES_PASSWORD: postgres
+  redis:
+    image: docker.io/redis/redis-stack-server
+    restart: unless-stopped
+    network_mode: service:app
+
+volumes:
+  postgres-data: