ci: add GitHub Actions workflows

- Add CI workflow for building with multiple GCC versions
- Add test suite execution
- Add static analysis with clang-tidy
- Add Flox environment build verification
- Update README with CI documentation

Co-Authored-By: [email protected] <[email protected]>

.github/workflows/ci.yml

@@ -0,0 +1,48 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        gcc: ['9', '10', '11']
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y help2man clang-tidy
+
+      - name: Build
+        run: make
+
+      - name: Run tests
+        run: make test
+
+      - name: Lint
+        run: make lint
+
+  flox-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Flox
+        uses: flox/install-flox@v1
+
+      - name: Build with Flox
+        run: |
+          flox activate
+          make
+
+      - name: Test with Flox
+        run: |
+          flox activate
+          make test

README.md

@@ -142,3 +142,13 @@ This project is developed and maintained with Flox.
 
 1. `flox activate`
 2. `make`
+
+## Continuous Integration
+
+The project uses GitHub Actions for CI with the following checks:
+- Building with multiple GCC versions
+- Running the test suite
+- Static analysis with clang-tidy
+- Building in Flox environment
+
+All checks must pass before merging pull requests.