[ci][add] Basic CI for checks & deployment

.github/workflows/build_and_tests.yml

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+name: Build, test and deploy Ragger
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - '*'
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+      - develop
+
+jobs:
+  package_and_deploy:
+    name: Build and deploy Ledgered Python Package
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Clone
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+
+    # Fetching dependencies from test.pypi,org or pypi.org depending on the package destination:
+    # tag -> pypi.org, not tag -> test.pypi.org
+    - name: Build Ledgered Python package
+      run: |
+        pip install --upgrade pip build twine
+        if [[ ${{ github.ref }} == "refs/tags/"* ]]; \
+        then \
+            python -m build; \
+            pip install .
+        else \
+            PIP_EXTRA_INDEX_URL=https://test.pypi.org/simple/ python -m build; \
+            pip install --extra-index-url https://test.pypi.org/simple/ .
+        fi
+        python -m twine check dist/*
+        echo "TAG_VERSION=$(python -c 'from ledgered import __version__; print(__version__)')" >> "$GITHUB_ENV"
+
+    - name: Display current status
+      run: |
+        echo "Current status is:"
+        if [[ ${{ github.ref }} == "refs/tags/"* ]]; \
+        then \
+            echo "- Triggered from tag, will be deployed on pypi.org"; \
+        else \
+            echo "- Not triggered from tag, will be deployed on test.pypi.org"; \
+        fi
+        echo "- Tag version: ${{ env.TAG_VERSION }}"
+
+    - name: Check version against CHANGELOG
+      if: startsWith(github.ref, 'refs/tags/')
+      run: |
+        CHANGELOG_VERSION=$(grep -Po '(?<=## \[)(\d+\.)+[^\]]' CHANGELOG.md | head -n 1)
+        if [ "${{ env.TAG_VERSION }}" == "${CHANGELOG_VERSION}" ]; \
+        then \
+            exit 0; \
+        else \
+            echo "Tag '${{ env.TAG_VERSION }}' and CHANGELOG '${CHANGELOG_VERSION}' versions mismatch!"; \
+            exit 1; \
+        fi
+
+    - name: Publish Python package on pypi.org
+      if: success() && github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+      run: python -m twine upload dist/*
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.PYPI_PUBLIC_API_TOKEN  }}
+        TWINE_NON_INTERACTIVE: 1
+
+    - name: Publish a release on the repo
+      if: success() && github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+      uses: "marvinpinto/action-automatic-releases@latest"
+      with:
+        automatic_release_tag: "v${{ env.TAG_VERSION }}"
+        repo_token: "${{ secrets.GITHUB_TOKEN }}"
+        prerelease: true
+        files: |
+          LICENSE
+          dist/
+
+    - name: Publish Python package on test.pypi.org
+      if: success() && github.event_name == 'push'
+      run: python -m twine upload --repository testpypi dist/*
+      env:
+        TWINE_USERNAME: __token__
+        TWINE_PASSWORD: ${{ secrets.TEST_PYPI_PUBLIC_API_TOKEN  }}
+        TWINE_NON_INTERACTIVE: 1

.github/workflows/codeql-analysis.yml

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+name: "CodeQL"
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches:
+      - master
+      - develop
+  schedule:
+    - cron: '35 0 * * 5'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: "python"
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+        queries: +security-and-quality
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/fast-checks.yml

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+name: Fast checks
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - develop
+      - master
+  pull_request:
+
+jobs:
+  lint:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - run: pip install flake8
+    - name: Flake8 lint Python code
+      run: find src/ -type f -name '*.py' -exec flake8 --max-line-length=120 '{}' '+'
+
+  yapf:
+    name: Formatting
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - run: pip install yapf toml
+    - name: Yapf source formatting
+      run: |
+        yapf src/ --recursive -d
+
+  mypy:
+    name: Type checking
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - run: pip install mypy types-toml
+    - name: Mypy type checking
+      run: mypy src
+
+  bandit:
+    name: Security checking
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - run: pip install bandit
+    - name: Bandit security checking
+      run: bandit -r src -ll
+
+  misspell:
+    name: Check misspellings
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone
+      uses: actions/checkout@v3
+    - name: Check misspellings
+      uses: codespell-project/actions-codespell@v1
+      with:
+        builtin: clear,rare
+        check_filenames: true