ci: add GitHub Actions workflow (lint, Kotlin tests, build)

Bootstrap workflow with the jobs that pass on current master: lint,
Kotlin tests, and build. TypeScript and unit test jobs are added in
#158 alongside the fixes they need (tsconfig exclude, passWithNoTests).

Co-authored-by: Claude <claude@anthropic.com>

Author: pavelzeman

.github/workflows/ci.yml

@@ -0,0 +1,51 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: npm
+      - run: npm ci
+      - run: npm run lint
+
+  kotlin-tests:
+    name: Kotlin Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: gradle
+      - name: Run Kotlin unit tests
+        working-directory: test-runner
+        run: ./gradlew test
+
+  build:
+    name: Build Package
+    runs-on: ubuntu-latest
+    needs: [lint, kotlin-tests]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: npm
+      - run: npm ci
+      - run: npm run prepare