[ci] Add basic github actions infrastructure

Author: vgvassilev

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: ${{ matrix.compiler }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [gcc, clang]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          if [ "${{ matrix.compiler }}" = "gcc" ]; then
+            sudo apt-get install -y gcc g++ cmake make
+            echo "CC=gcc" >> $GITHUB_ENV
+            echo "CXX=g++" >> $GITHUB_ENV
+          else
+            sudo apt-get install -y clang cmake make
+            echo "CC=clang" >> $GITHUB_ENV
+            echo "CXX=clang++" >> $GITHUB_ENV
+          fi
+
+      - name: Configure project
+        run: |
+          cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+
+      - name: Build project
+        run: |
+          cmake --build build -- -j$(nproc)
+
+      - name: Run tests
+        run: |
+          ctest --test-dir build --output-on-failure

.github/workflows/clang-format.yml

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+name: clang-format
+
+on:
+  pull_request:
+    paths:
+      - '**/*.h'
+      - '**/*.cpp'
+      - '**/*.cc'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  precheckin:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+
+      - name: Install clang-format
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y clang-format-18
+          clang-format-18 --version
+
+      - name: Run git-clang-format
+        run: |
+          PR_BASE=$(git rev-list ${{ github.event.pull_request.head.sha }} ^${{ github.event.pull_request.base.sha }} | tail --lines 1 | xargs -I {} git rev-parse {}~1)
+          echo "running git clang-format against $PR_BASE commit"
+          GIT="git -c color.ui=always -c diff.wsErrorHighlight=all -c color.diff.whitespace='red reverse'"
+
+          if ! $GIT clang-format-18 --diff --binary clang-format-18 $PR_BASE; then
+            echo "::error::Code is not properly formatted. Please run 'git clang-format-18 HEAD~' locally. \n
+                for multiple commits we should place the formatting changes in the related commit with:\n
+                \t\tgit rebase -i -x 'git-clang-format-18 master && git commit -a --allow-empty --fixup=HEAD' --strategy-option=theirs origin/master\n
+                \t\t Then inspect the results with: git log --oneline\n
+                \t\t Then squash without poluting the history with: git rebase --autosquash -i master\n"
+             exit 1
+          fi

.github/workflows/clang-tidy-review-post.yml

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+name: Post clang-tidy review comments
+
+on:
+  workflow_run:
+    workflows: ["clang-tidy-review"]
+    types:
+      - completed
+
+permissions:
+  checks: write
+  pull-requests: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Post review comments
+        id: post-review
+        uses: ZedThree/clang-tidy-review/[email protected]
+        with:
+          max_comments: 10
+
+       # If there are any comments, fail the check
+      - if: steps.post-review.outputs.total_comments > 0
+        run: exit 1

.github/workflows/clang-tidy-review.yml

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+name: clang-tidy-review
+
+on:
+  pull_request:
+    paths:
+      - '**.h'
+      - '**.cpp'
+      - '**.cc'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v4
+
+      - name: Install LLVM and Clang
+        uses: KyleMayes/install-llvm-action@v2
+        with:
+          version: "20"
+
+      - name: install lit
+        run: pip install lit
+
+      - name: run git config command
+        run: |
+          git config --global --add safe.directory /github/workspace
+
+      - name: Run clang-tidy
+        uses: ZedThree/[email protected]
+        id: review
+        with:
+          build_dir: build
+          apt_packages: cmake,libxml2,libxml2-dev,libtinfo-dev,zlib1g-dev,libzstd-dev
+          exclude: "test/*,unittests/*"
+          split_workflow: true
+          config_file: .clang-tidy
+          cmake_command: >
+            CC=$GITHUB_WORKSPACE/llvm/bin/clang CXX=$GITHUB_WORKSPACE/llvm/bin/clang++
+            cmake . -B build -DLLVM_DIR="$GITHUB_WORKSPACE/llvm"
+            -DClang_DIR="$GITHUB_WORKSPACE/llvm"
+            -DCMAKE_BUILD_TYPE="Release"
+            -DLLVM_EXTERNAL_LIT="`which lit`"
+            -DCMAKE_EXPORT_COMPILE_COMMANDS=On
+
+      - name: Upload artifacts
+        uses: ZedThree/clang-tidy-review/[email protected]