ci: add GitHub Actions workflow (analyze + test) and CI badge

Author: bpstack

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  analyze-and-test:
+    name: Analyze & test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+          flutter-version: 3.44.1
+          cache: true
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Generate code (freezed / json_serializable)
+        run: dart run build_runner build
+
+      - name: Analyze
+        run: flutter analyze
+
+      - name: Run tests
+        run: flutter test

README.md

@@ -1,5 +1,7 @@
 # BP PDF
 
+[![CI](https://github.com/bpstack/bp_pdf/actions/workflows/ci.yml/badge.svg)](https://github.com/bpstack/bp_pdf/actions/workflows/ci.yml)
+
 A local-first PDF annotation editor built with Flutter. Everything runs on your device — no server, no accounts, no internet required.
 
 ## What it does