Upgrade container and linting

.devcontainer.json

@@ -0,0 +1,41 @@
+// See https://aka.ms/vscode-remote/devcontainer.json for format details.
+{
+	"image": "mcr.microsoft.com/devcontainers/python:3.12",
+	"postCreateCommand": "scripts/setup",
+	"forwardPorts": [
+		8123
+	],
+	"portsAttributes": {
+		"8123": {
+			"label": "Home Assistant",
+			"onAutoForward": "notify"
+		}
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"charliermarsh.ruff",
+				"ms-python.python",
+				"ms-python.vscode-pylance",
+				"github.vscode-pull-request-github"
+			],
+			"settings": {
+				"files.eol": "\n",
+				"editor.tabSize": 4,
+				"editor.formatOnPaste": true,
+				"editor.formatOnSave": true,
+				"editor.formatOnType": false,
+				"files.trimTrailingWhitespace": true,
+				"terminal.integrated.shell.linux": "/bin/bash",
+				"python.analysis.typeCheckingMode": "basic",
+				"python.analysis.autoImportCompletions": true,
+				"python.defaultInterpreterPath": "/usr/local/bin/python",
+				"[python]": {
+					"editor.defaultFormatter": "charliermarsh.ruff"
+				}
+			}
+		}
+	},
+	"remoteUser": "vscode",
+	"features": {}
+}

.gitattributes

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+* text=auto eol=lf

.github/workflows/lint.yml

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+name: "Lint"
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+    branches:
+      - "main"
+
+jobs:
+  ruff:
+    name: "Ruff"
+    runs-on: "ubuntu-latest"
+    steps:
+        - name: "Checkout the repository"
+          uses: "actions/checkout@v4.1.7"
+
+        - name: "Set up Python"
+          uses: actions/setup-python@v5.1.0
+          with:
+            python-version: "3.12"
+            cache: "pip"
+
+        - name: "Install requirements"
+          run: python3 -m pip install -r requirements.txt
+
+        - name: "Lint"
+          run: python3 -m ruff check .
+
+        - name: "Format"
+          run: python3 -m ruff format . --check