.github: add CI files and issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: 'Bug: '
+labels: ''
+assignees: ''
+
+---
+
+## Describe the bug
+
+<!-- 
+
+A clear and concise description of what the bug is.
+
+(Before opening an issue, check StrictDoc's 'Troubleshooting' document, 
+which contains solutions to the most common issues.)
+
+-->
+
+## To Reproduce
+
+<!--
+
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+-->
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Screenshots
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+## Environment
+
+<!--
+
+ - OS: (e.g. Ubuntu Linux 22.04, macOS 12.6.3 (21G419), Windows 11)
+ - Browser: (e.g. Chrome, Safari)
+ - Version: (e.g. 22)
+
+-->
+
+## Additional context
+
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Create a feature request
+title: 'Feature: '
+labels: ''
+assignees: ''
+
+---
+
+<!-- Feel free to complete only the relevant sections and skip the rest. -->
+
+## Description
+
+<!-- Provide a clear and concise description of the feature you want to request. -->
+
+## Problem
+
+<!-- Describe the problem or gap that this feature aims to address. Why is it needed? -->
+
+## Solution
+
+<!-- Suggest a possible solution or feature implementation. -->
+
+## Additional Information
+
+<!-- Add any other relevant details, such as dependencies, related issues, or references to similar features elsewhere. -->

.github/ISSUE_TEMPLATE/general.md

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+---
+name: General issue
+about: Create a general issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+

.github/workflows/ci-linux-ubuntu-latest.yml

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+name: "HTML2PDF on Linux"
+
+on:
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [
+          "3.9", "3.12"
+        ]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Upgrade pip
+      run: |
+        python -m pip install --upgrade pip
+
+    - name: Install Python packages
+      run: |
+        pip install -r requirements.development.txt
+
+    - name: Clone HTML2PDF.js
+      run: |
+        invoke bootstrap
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Install HPDF dependencies.
+      run: |
+        python developer/pip_install_hpdf_deps.py
+
+    - name: Run Lint tasks
+      run: |
+        invoke lint
+
+    - name: Build HTML2PDF.js
+      run: |
+        invoke build
+
+    - name: Run tests
+      run: |
+        invoke test

.github/workflows/ci-mac.yml

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+name: "HTML2PDF on macOS"
+
+on:
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  build:
+    runs-on: macos-13
+
+    strategy:
+      matrix:
+        python-version: [
+          "3.8", "3.12"
+        ]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Upgrade pip
+      run: |
+        python -m pip install --upgrade pip
+
+    - name: Install minimal Python packages
+      run: |
+        pip install -r requirements.development.txt
+
+    - name: Clone HTML2PDF.js
+      run: |
+        invoke bootstrap
+
+    - name: Install HPDF dependencies.
+      run: |
+        python developer/pip_install_hpdf_deps.py
+
+    - name: Run Lint tasks
+      run: |
+        invoke lint
+
+    - name: Build HTML2PDF.js
+      run: |
+        invoke build
+
+    - name: Run tests
+      run: |
+        invoke test

.github/workflows/ci-windows.yml

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+name: "HTML2PDF on Windows"
+
+# FIXME: Disabled until WDM detects Chrome on Windows reliably.
+# on:
+#   pull_request:
+#     branches: [ "**" ]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.12"]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Upgrade pip
+      run: |
+        python -m pip install --upgrade pip
+
+    - name: Install minimal Python packages
+      run: |
+        pip install -r requirements.development.txt
+
+    - name: Clone HTML2PDF.js
+      run: |
+        invoke bootstrap
+
+    - name: Install HPDF dependencies.
+      run: |
+        python developer/pip_install_hpdf_deps.py
+
+    - name: Run Lint tasks
+      run: |
+        invoke lint
+
+    - name: Build HTML2PDF.js
+      run: |
+        invoke build
+
+    - name: Run tests (Bash)
+      run: |
+        invoke test
+      shell: bash