CI by building the action (#1)

with the help of: https://github.com/esphome/build-action

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+name: build
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  buildit:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@main
+        with:
+          path: esphome-dlms-meter
+
+      - name: Copy config
+        run: |
+          cp "./esphome-dlms-meter/meter01.example.yaml" "meter01.yaml"
+
+      - name: Build
+        uses: esphome/build-action@v1
+        with:
+          yaml_file: meter01.yaml