Add CI tests for libxmlsec1 versions, lxml versions.

Author: jonathangreen

Diff for: .github/workflows/ci.yml

@@ -0,0 +1,91 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+jobs:
+  ci:
+    strategy:
+      # Allows for matrix sub-jobs to fail without canceling the rest
+      fail-fast: false
+
+      matrix:
+        os:
+          - "ubuntu-latest"
+          - "macos-latest"
+        # Test with the earliest and latest supported versions of Python, lxml, and libxmlsec1
+        # so that we get reasonable coverage of the supported versions.
+        python-version:
+          - "3.7"
+          - "3.12"
+        lxml-version:
+          - "5.0.0"
+          - "5.1.0"
+        libxmlsec1-version:
+          - "1.3.3"
+          - "1.2.39"
+
+        exclude:
+          # LXML did not upload a wheel for Python 3.7 so we can't test
+          # this configuration.
+          - os: "macos-latest"
+            python-version: "3.7"
+            lxml-version: "5.0.0"
+
+    env:
+      PYXMLSEC_STATIC_DEPS: "true"
+      PYXMLSEC_LIBXML2_VERSION: "2.12.3"
+      PYXMLSEC_LIBXSLT_VERSION: "1.1.39"
+
+    # This defaults to 360 minutes (6h) which is way too long and if a test gets stuck, it can block other pipelines.
+    # From testing, the runs tend to take 3-8 minutes, so a limit of 30 minutes should be enough.
+    timeout-minutes: 30
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout repo
+        uses: actions/[email protected]
+
+      - name: Setup Python
+        uses: actions/[email protected]
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Cache libs
+        uses: actions/[email protected]
+        with:
+          path: libs/*.tar.gz
+          key: > 
+            libs-
+            ${{ matrix.os }}-
+            ${{ env.PYXMLSEC_LIBXML2_VERSION }}-
+            ${{ env.PYXMLSEC_LIBXSLT_VERSION }}-
+            ${{ matrix.libxmlsec1-version }}
+
+      - name: Install build dependencies
+        run: pip install --upgrade pip setuptools wheel build
+
+      - name: Build wheel
+        run: |
+          python -m build
+          rm -rf build/
+        env:
+          PYXMLSEC_XMLSEC1_VERSION: ${{ matrix.libxmlsec1-version }}
+
+      - name: Install test dependencies
+        run: |
+          pip install --only-binary=lxml --upgrade -r requirements-test.txt lxml==${{ matrix.lxml-version }}
+          pip install xmlsec --only-binary=xmlsec --no-index --find-links=dist/
+
+      - name: Run tests
+        run: |
+          pytest -v --color=yes