ci: add Dokka for kdoc documentation generation and deployment (#3024)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

.github/workflows/docs.yml

@@ -0,0 +1,63 @@
+# This workflow builds and deploys the Dokka documentation to GitHub Pages.
+
+name: Deploy Documentation
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["main"]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build-docs:
+    if: github.repository == 'meshtastic/Meshtastic-Android'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+          submodules: 'recursive'
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          java-version: '21'
+          distribution: 'jetbrains'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build Dokka HTML documentation
+        run: ./gradlew :app:dokkaHtml
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: app/build/dokka
+
+  deploy:
+    if: github.repository == 'meshtastic/Meshtastic-Android'
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build-docs
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4