Add GitHub Actions workflow for CI (#94)

* Add GitHub Actions workflow for firmware build process

* Fix GitHub Actions workflow to correctly reference YAML files

* Add step to move generated files to output directory in build workflow

* Add consolidation step in build workflow and update project name in YAML

* Update artifact download name in build workflow to include project matrix

* Refactor GitHub Actions workflow to streamline firmware build and consolidation steps

* Remove unnecessary environment variable for release URL in build workflow

* Remove old build workflow and add new CI workflow for firmware builds

* Add scheduled CI trigger and update YAML file path in workflow

* Update CI workflow job names for clarity in firmware builds

* Rename project in YAML configuration from "onju-voice-microwakeword" to "onju-voice"

.github/workflows/ci.yaml

@@ -0,0 +1,37 @@
+---
+name: CI
+
+on:
+  pull_request:
+  # Every Monday at 4:00 UTC
+  schedule:
+    - cron: "0 4 * * 1"
+
+concurrency:
+  # yamllint disable-line rule:line-length
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    name: ${{ matrix.file }} / ${{ matrix.esphome-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      max-parallel: 3
+      matrix:
+        file:
+          - onju-voice
+          - onju-voice-microwakeword
+        esphome-version:
+          - latest
+          - beta
+          - dev
+    steps:
+      - name: ⤵️ Check out code from GitHub
+        uses: actions/[email protected]
+      - name: 🔨 Build firmware - ${{ matrix.esphome-version }}
+        uses: esphome/[email protected]
+        with:
+          yaml-file: esphome/${{ matrix.file }}.yaml
+          version: ${{ matrix.esphome-version }}