Add GitHub actions

.github/workflows/hacs.yaml

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+name: Validate HACS
+on:
+  push:
+  pull_request:
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        name: Download repo
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v2
+        name: Setup Python
+        with:
+          python-version: '3.8.x'
+
+      - uses: actions/cache@v2
+        name: Cache
+        with:
+          path: |
+            ~/.cache/pip
+          key: custom-component-ci
+
+      - name: HACS Action
+        uses: hacs/action@main
+        with:
+          CATEGORY: integration

.github/workflows/hassfest.yaml

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+name: Validate with hassfest
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  validate:
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: "actions/checkout@v2"
+      - uses: home-assistant/actions/hassfest@master

.github/workflows/release.yaml

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+name: Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  release:
+    name: Prepare release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download repo
+        uses: actions/checkout@v1
+
+      - name: Zip mpk_lodz dir
+        run: |
+          cd /home/runner/work/Home-Assistant-custom-components-MPK-Lodz/Home-Assistant-custom-components-MPK-Lodz/custom_components/mpk_lodz
+          zip mpk_lodz.zip -r ./
+
+      - name: Upload zip to release
+        uses: svenstaro/upload-release-action@v1-release
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: /home/runner/work/Home-Assistant-custom-components-MPK-Lodz/Home-Assistant-custom-components-MPK-Lodz/custom_components/mpk_lodz/mpk_lodz.zip
+          asset_name: mpk_lodz.zip
+          tag: ${{ github.ref }}
+          overwrite: true

hacs.json

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+{
+  "name": "MPK Łódź",
+  "domains": ["sensor"],
+  "country": "PL",
+  "render_readme": true,
+  "zip_release": true,
+  "filename": "mpk_lodz.zip"
+}