Add CI on GitHub Actions (#4)

This patch adds CI (C++ unit tests and pre-commit hooks) to GitHub Actions.

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: [ybubnov]

.github/workflows/cxx_unit_test.yaml

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+name: CXX Unit Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  unit-tests:
+    runs-on: ubuntu-22.04
+    container:
+      image: ubuntu:22.04
+
+    steps:
+    - name: Checkout source code
+      id: checkout
+      uses: actions/checkout@v4
+
+    - name: Configure apt to disable recommendations installation
+      id: configure_apt
+      run: |
+        echo 'APT::Install-Recommends "false";' >> /etc/apt/apt.conf
+        echo 'APT::Install-Suggests "false";' >> /etc/apt/apt.conf
+
+    - name: Install third-party libraries and tools
+      id: install_packages
+      run: |
+        apt-get update
+        apt-get install -y cmake build-essential libboost-test-dev libfmt-dev wget unzip
+        apt-get install -y python3-pip python3-numpy
+
+    - name: Install python libraries
+      id: install_torch
+      run: pip3 install 'torch>=2.2.0+cpu' --index-url https://download.pytorch.org/whl/cpu
+
+    - name: Find PyTorch cmake prefix path
+      id: find_torch
+      run: >
+        echo "cmake_prefix_path=$(python3 -c 'import torch; print(torch.utils.cmake_prefix_path)')"
+        >> $GITHUB_OUTPUT
+
+    - name: Configure CMake
+      run: >
+        cmake
+        -DCMAKE_PREFIX_PATH=${{steps.find_torch.outputs.cmake_prefix_path}}
+        -B ${{github.workspace}}/build
+
+    - name: Build CXX library
+      run: cmake --build ${{github.workspace}}/build
+
+    - name: Run unit-tests
+      run: make -C ${{github.workspace}}/build test ARGS="--verbose" BOOST_TEST_LOG_LEVEL="test_suite"

.github/workflows/pre_commit.yaml

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+name: Pre-Commit
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Install pre-commit
+        run: pip install pre-commit
+      - name: Run pre-commit
+        run: pre-commit run --all-files --show-diff-on-failure --color=always