CI: add per-chapter workflows (ch2–ch5)

Author: srikanthbaride

.github/workflows/_chapter-tests.yml

@@ -0,0 +1,55 @@
+name: _chapter-tests
+
+on:
+  workflow_call:
+    inputs:
+      chapter:
+        required: true
+        type: string
+      py-versions:
+        required: false
+        type: string
+        default: '["3.10","3.11","3.12"]'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ${{ fromJson(inputs.py-versions) }}
+
+    env:
+      PYTHONPATH: ${{ github.workspace }}
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Cache pip
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-py${{ matrix.python-version }}-${{ hashFiles('**/requirements*.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-py${{ matrix.python-version }}-
+
+      - name: Install dependencies
+        shell: bash
+        run: |
+          python -m pip install --upgrade pip
+          if [ -f "${{ inputs.chapter }}/requirements.txt" ]; then
+            python -m pip install -r "${{ inputs.chapter }}/requirements.txt"
+          fi
+          if [ -f "${{ inputs.chapter }}/requirements_ch3.txt" ]; then
+            python -m pip install -r "${{ inputs.chapter }}/requirements_ch3.txt"
+          fi
+          python -m pip install pytest
+
+      - name: Run tests
+        run: python -m pytest -q ${{ inputs.chapter }}/tests

.github/workflows/ch2.yml

@@ -0,0 +1,21 @@
+name: ch2 tests
+
+on:
+  push:
+    branches: [ "main" ]
+    paths:
+      - "ch2_rl_formulation/**"
+      - ".github/workflows/ch2.yml"
+      - ".github/workflows/_chapter-tests.yml"
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - "ch2_rl_formulation/**"
+      - ".github/workflows/ch2.yml"
+      - ".github/workflows/_chapter-tests.yml"
+
+jobs:
+  call:
+    uses: ./.github/workflows/_chapter-tests.yml
+    with:
+      chapter: ch2_rl_formulation

.github/workflows/ch3.yml

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+name: ch3 tests
+
+on:
+  push:
+    branches: [ "main" ]
+    paths:
+      - "ch3_multi_armed_bandits/**"
+      - ".github/workflows/ch3.yml"
+      - ".github/workflows/_chapter-tests.yml"
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - "ch3_multi_armed_bandits/**"
+      - ".github/workflows/ch3.yml"
+      - ".github/workflows/_chapter-tests.yml"
+
+jobs:
+  call:
+    uses: ./.github/workflows/_chapter-tests.yml
+    with:
+      chapter: ch3_multi_armed_bandits

.github/workflows/ch4.yml

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+name: ch4 tests
+
+on:
+  push:
+    branches: [ "main" ]
+    paths:
+      - "ch4_dynamic_programming/**"
+      - ".github/workflows/ch4.yml"
+      - ".github/workflows/_chapter-tests.yml"
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - "ch4_dynamic_programming/**"
+      - ".github/workflows/ch4.yml"
+      - ".github/workflows/_chapter-tests.yml"
+
+jobs:
+  call:
+    uses: ./.github/workflows/_chapter-tests.yml
+    with:
+      chapter: ch4_dynamic_programming

.github/workflows/ch5.yml

@@ -0,0 +1,21 @@
+name: ch5 tests
+
+on:
+  push:
+    branches: [ "main" ]
+    paths:
+      - "ch5_monte_carlo/**"
+      - ".github/workflows/ch5.yml"
+      - ".github/workflows/_chapter-tests.yml"
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - "ch5_monte_carlo/**"
+      - ".github/workflows/ch5.yml"
+      - ".github/workflows/_chapter-tests.yml"
+
+jobs:
+  call:
+    uses: ./.github/workflows/_chapter-tests.yml
+    with:
+      chapter: ch5_monte_carlo