Add devcontainer configuration (#62)

.devcontainer/Dockerfile

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+FROM ghcr.io/home-assistant/devcontainer:addons
+
+RUN \
+  apt-get update \
+  && apt-get install -y --no-install-recommends \
+    python3-pip
+
+COPY script/requirements.txt /
+
+RUN pip install -r /requirements.txt

.devcontainer/devcontainer.json

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+{
+  "name": "ESPHome Home Assistant add-on devcontainer",
+  "image": "ghcr.io/esphome/devcontainer:addons",
+  "appPort": [
+    "7123:8123",
+    "7357:4357"
+  ],
+  "postStartCommand": "bash devcontainer_bootstrap",
+  "runArgs": [
+    "-e",
+    "GIT_EDITOR=code --wait",
+    "--privileged"
+  ],
+  "containerEnv": {
+    "WORKSPACE_DIRECTORY": "${containerWorkspaceFolder}"
+  },
+  "extensions": [
+    "timonwong.shellcheck",
+    "esbenp.prettier-vscode"
+  ],
+  "mounts": [
+    "type=volume,target=/var/lib/docker"
+  ],
+  "settings": {
+    "terminal.integrated.profiles.linux": {
+      "zsh": {
+        "path": "/usr/bin/zsh"
+      }
+    },
+    "terminal.integrated.defaultProfile.linux": "zsh",
+    "editor.formatOnPaste": false,
+    "editor.formatOnSave": true,
+    "editor.formatOnType": true,
+    "files.trimTrailingWhitespace": true
+  }
+}

.github/workflows/devcontainer-build.yaml

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+name: Build devcontainer image
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - .devcontainer/**
+  schedule:
+    - cron: '0 0 1 * *'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - .devcontainer/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3.1.0
+      - name: Log in to the GitHub container registry
+        uses: docker/login-action@v2.1.0
+        if: github.event_name != 'pull_request'
+        with:
+            registry: ghcr.io
+            username: ${{ github.repository_owner }}
+            password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2.1.0
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2.2.1
+      - name: Build and Push
+        uses: docker/build-push-action@v3.2.0
+        with:
+          context: .
+          file: .devcontainer/Dockerfile
+          tags: ghcr.io/${{ github.repository_owner }}/devcontainer:addons
+          push: ${{ github.event_name != 'pull_request' }}
+          platforms: linux/amd64,linux/arm64

.vscode/tasks.json

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+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Start Home Assistant",
+      "type": "shell",
+      "command": "supervisor_run",
+      "group": {
+        "kind": "test",
+        "isDefault": true
+      },
+      "presentation": {
+        "reveal": "always",
+        "panel": "new"
+      },
+      "problemMatcher": []
+    }
+  ]
+}