ci(workflows): add GitHub Actions for coverage, docs, and test/lint a…

…utomation

- Added `coverage.yml` for automated code coverage reports with Codecov on pushes and pull requests to `main`
- Created `docs.yml` to build Sphinx documentation on-demand, ensuring the latest documentation for workflow dispatch
- Implemented `test-lint.yml` to automate testing, linting with flake8, and code formatting checks with black for consistency

These workflows streamline CI/CD for testing, documentation, and coverage, improving project reliability and maintainability.

.github/workflows/coverage.yml

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+name: Code Coverage
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  codecov:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up Python
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install ".[dev]"
+
+      - name: Run tests with coverage
+        run: pytest --cov=spacy_ewc --cov-report xml tests/
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4.6.0
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: coverage.xml
+          flags: unittests
+          name: codecov-umbrella
+          verbose: true

.github/workflows/docs.yml

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+name: Documentation
+
+on: workflow_dispatch
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up Python
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies for docs
+        run: |
+          python -m pip install --upgrade pip
+          pip install ".[doc]"
+
+      - name: Build Sphinx documentation
+        run: sphinx-build -b html docs/ docs/_build/
+
+      # Optional: Deploy to GitHub Pages
+      # - name: Deploy to GitHub Pages
+      #   uses: peaceiris/actions-gh-pages@<latest_commit_sha_for_gh_pages>
+      #   with:
+      #     github_token: ${{ secrets.GITHUB_TOKEN }}
+      #     publish_dir: docs/_build

.github/workflows/test-lint.yml

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+name: Test and Lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test-lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set up Python
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
+        with:
+          python-version: "3.12"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install ".[dev]"
+
+      - name: Run tests
+        run: pytest -x --disable-warnings
+
+      - name: Run linting with flake8
+        run: |
+          flake8 spacy_ewc/ examples/
+
+      - name: Check code formatting with black
+        run: black --check spacy_ewc/ examples/
+
+      - name: Run EWC example script
+        run: python examples/ewc_ner_training_example.py