ci: validate DS18B20 Heltec V3 firmware

.github/workflows/ds18b20-heltec-v3.yml

@@ -0,0 +1,40 @@
+name: DS18B20 Heltec V3
+
+on:
+  push:
+    branches:
+      - ds18b20-heltec-v3-v2.7.26
+  pull_request:
+    branches:
+      - ds18b20-heltec-v3-v2.7.26
+  workflow_dispatch:
+
+permissions: read-all
+
+jobs:
+  version:
+    runs-on: ubuntu-latest
+    outputs:
+      long: ${{ steps.version.outputs.long }}
+    steps:
+      - uses: actions/checkout@v7
+      - id: version
+        run: echo "long=$(./bin/buildinfo.py long)" >> "$GITHUB_OUTPUT"
+
+  firmware:
+    needs: version
+    uses: ./.github/workflows/build_firmware.yml
+    with:
+      version: ${{ needs.version.outputs.long }}
+      platform: esp32s3
+      pio_env: heltec-v3-ds18b20
+
+  ds18b20-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          submodules: recursive
+      - uses: ./.github/actions/setup-native
+      - name: Run DS18B20 unit tests
+        run: platformio test -e native -f test_ds18b20