Adding devcontainer files

Author: pamelafox

.devcontainer/Dockerfile

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+ARG VARIANT=3
+FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
+
+RUN curl -fsSL https://aka.ms/install-azd.sh | bash
+
+ENV PYTHONUNBUFFERED 1
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends postgresql-client

.devcontainer/devcontainer.json

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+{
+	"name": "Python 3 & PostgreSQL",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "app",
+	"workspaceFolder": "/workspace",
+	"settings": {
+		"sqltools.connections": [
+			{
+				"name": "Container database",
+				"driver": "PostgreSQL",
+				"previewLimit": 50,
+				"server": "localhost",
+				"port": 5432,
+				"database": "app",
+				"username": "app_user",
+				"password": "app_password"
+			}
+		],
+		"python.pythonPath": "/usr/local/bin/python",
+		"python.languageServer": "Pylance",
+		"python.linting.enabled": true,
+		"python.linting.mypyEnabled": true,
+		"python.testing.pytestEnabled": true,
+		"python.formatting.provider": "black",
+		"python.formatting.blackArgs": [
+			"--line-length=80"
+		],
+		"python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
+		"python.formatting.blackPath": "/usr/local/py-utils/bin/black",
+		"python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
+		"python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
+		"python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+		"python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+		"python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
+		"python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
+		"python.linting.pylintPath": "/usr/local/py-utils/bin/pylint",
+		"python.testing.pytestPath": "/usr/local/py-utils/bin/pytest"
+	},
+	"features": {
+        "ghcr.io/devcontainers/features/azure-cli:1": {
+            "version": "latest"
+        },
+		"ghcr.io/devcontainers/features/github-cli:1": {
+            "version": "latest"
+        }
+    },
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"ms-azuretools.azure-dev",
+		"ms-python.python",
+		"ms-python.vscode-pylance",
+		"mtxr.sqltools",
+		"mtxr.sqltools-driver-pg"
+	],
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+		5000, 5432
+	]
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "",
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "vscode"
+}

.devcontainer/docker-compose.yml

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+version: "3"
+
+services:
+  app:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile
+      args:
+        # [Choice] Python version: 3, 3.8, 3.7, 3.6
+        VARIANT: 3.9
+        # On Linux, you may need to update USER_UID and USER_GID below if not your local UID is not 1000.
+        USER_UID: 1000
+        USER_GID: 1000
+
+    volumes:
+      - ..:/workspace:cached
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+    # Runs app on the same network as the database container, allows "forwardPorts" in devcontainer.json function.
+    network_mode: service:db
+
+  db:
+    image: postgres:latest
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: "${DBUSER}"
+      POSTGRES_DB: "${DBNAME}"
+      POSTGRES_PASSWORD: "${DBPASS}"
+
+    # Add "forwardPorts": ["5432"] to **devcontainer.json** to forward PostgreSQL locally.
+    # (Adding the "ports" property to this file will not forward from a Codespace.)
+
+volumes:
+  postgres-data: