Add initial GH Actions setup

.github/tl_packages

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+l3build latex latex-bin luatex
+cm etex knuth-lib tex tex-ini-files unicode-data
+graphics xcolor luacolor
+csquotes hypdoc framed metalogo tikzducks pict2e hyperred

.github/workflows/check.yaml

@@ -0,0 +1,43 @@
+name: Test suite
+
+on:
+  push:
+    branches:
+      - '*'
+pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-22.04
+    name: Test suite
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install TeX Live
+        uses: zauguin/install-texlive@v3
+        with:
+          package_file: .github/tl_packages
+      - name: Run l3build
+        run: l3build check --show-log-on-error -q -H
+      - name: Archive failed test output
+        if: ${{ always() }}
+        uses: zauguin/l3build-failure-artifacts@v1
+        with:
+          name: testfiles
+  docs:
+    runs-on: ubuntu-22.04
+    name: Documentation
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install TeX Live
+        uses: zauguin/install-texlive@v3
+        with:
+          package_file: .github/tl_packages
+      - name: Run l3build
+        run: l3build doc -q -H
+      - name: Archive documentation
+        uses: actions/upload-artifact@v4
+        with:
+          name: Documentation
+          path: "**/*.pdf"