Migrate CI from CircleCI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,76 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - 'release/*'
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test_debug:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y cmake g++
+
+    - name: Configure CMake (Debug)
+      run: |
+        mkdir -p build-debug
+        cd build-debug
+        cmake -DCMAKE_BUILD_TYPE=debug ..
+
+    - name: Build (Debug)
+      run: |
+        cd build-debug
+        make
+
+    - name: Run tests (Debug)
+      run: |
+        cd build-debug
+        ctest --output-on-failure
+
+  test_release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y cmake g++
+
+    - name: Configure CMake (Release)
+      run: |
+        mkdir -p build-release
+        cd build-release
+        cmake -DCMAKE_BUILD_TYPE=release ..
+
+    - name: Build (Release)
+      run: |
+        cd build-release
+        make
+
+    - name: Run tests (Release)
+      run: |
+        cd build-release
+        ctest --output-on-failure

.gitignore

@@ -30,3 +30,8 @@
 
 # For Clion
 .idea/workspace.xml
+
+# Build directories
+build/
+build-*/
+cmake-build-*/

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://circleci.com/gh/tschijnmo/libcanon.svg?style=shield)](https://circleci.com/gh/tschijnmo/libcanon)
+[![CI](https://github.com/DrudgeCAS/libcanon/actions/workflows/ci.yml/badge.svg)](https://github.com/DrudgeCAS/libcanon/actions/workflows/ci.yml)
 
 # libcanon