Add GitHub Actions workflows for CI and Dependabot integration

Author: asessa

.github/dependabot.yml

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+---
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

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+name: Build
+
+on:
+  push:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+    platformio:
+      name: PlatformIO
+      runs-on: ubuntu-latest
+      strategy:
+        matrix:
+          board: [esp32dev]
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+
+        - name: Cache PlatformIO
+          uses: actions/cache@v4
+          with:
+            key: ${{ runner.os }}-pio
+            path: |
+              ~/.cache/pip
+              ~/.platformio
+
+        - name: Python
+          uses: actions/setup-python@v5
+          with:
+            python-version: '3.x'
+
+        - name: Install PlatformIO
+          run: |
+            python -m pip install -U pip
+            pip install -U platformio
+
+        - run: PLATFORMIO_SRC_DIR=examples/demo PIO_BOARD=${{ matrix.board }} pio run

.github/workflows/dependabot.yml

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+name: PlatformIO Dependabot
+
+on:
+  workflow_dispatch: # option to manually trigger the workflow
+  schedule:
+    # Runs every day at 00:00
+    - cron: '0 0 * * *'
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    name: run PlatformIO Dependabot
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: run PlatformIO Dependabot
+        uses: peterus/platformio_dependabot@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}

platformio.ini

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+[platformio]
+lib_dir = .
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+lib_deps =
+    mathieucarbou/AsyncTCP@^3.2.14
+    mathieucarbou/ESPAsyncWebServer@^3.3.23
+build_flags =
+    -D CONFIG_ASYNC_TCP_QUEUE_SIZE=512
+    -D CONFIG_ASYNC_TCP_RUNNING_CORE=1