add a GitHub workflow config (#1133)

.github/workflows/ci.yml

@@ -0,0 +1,138 @@
+name: Test + Docker
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  compile-and-test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 14
+
+    permissions:
+      contents: read
+      packages: read
+
+    env:
+      OTP_VERSION: "26.1.2"
+      ELIXIR_VERSION: "1.15.7"
+      FWUP_VERSION: "1.10.1"
+      MIX_ENV: "test"
+      DATABASE_URL: postgres://postgres:postgres@localhost:5432/nerves_hub_test
+
+    services:
+      db:
+        image: postgres:15
+        ports: ['5432:5432']
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{env.OTP_VERSION}}
+          elixir-version: ${{env.ELIXIR_VERSION}}
+
+      - name: Install system deps
+        run: |
+          wget https://github.com/fwup-home/fwup/releases/download/v${FWUP_VERSION}/fwup_${FWUP_VERSION}_amd64.deb
+          sudo dpkg -i fwup_1.10.1_amd64.deb && rm fwup_1.10.1_amd64.deb
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Cache deps
+        id: cache-deps
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-elixir-deps
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-${{ env.cache-name }}-
+
+      - name: Cache compiled build
+        id: cache-build
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-compiled-build
+        with:
+          path: _build
+          key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-${{ env.cache-name }}-
+            ${{ runner.os }}-mix-
+
+      - name: Clean to rule out incremental build as a source of flakiness
+        if: github.run_attempt != '1'
+        run: |
+          mix deps.clean --all
+          mix clean
+        shell: sh
+
+      - name: Install dependencies
+        run: mix deps.get
+
+      - name: Compiles without warnings
+        run: mix compile --warnings-as-errors
+
+      - name: Check Formatting
+        run: mix format --check-formatted
+
+      - name: Check for unused dependencies
+        run: mix deps.unlock --unused
+
+      - name: DB Setup
+        run: mix ecto.migrate.reset
+
+      - name: Run tests
+        run: mix test
+
+  build-and-publish:
+    runs-on: ubuntu-latest
+
+    needs: compile-and-test
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ghcr.io/nerves-hub/nerves-hub
+          tags: |
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+            # tag event (eg. "v1.2.3")
+            type=ref,event=tag
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          push: ${{ github.ref == 'refs/heads/main' || github.ref_type == 'tag' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}