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
+tools iftex infwarerr kvoptions
+csquotes hypdoc framed metalogo tikzducks pict2e hyperref pgf

.github/workflows/check.yaml

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+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"

.github/workflows/release.yaml

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+name: Release
+
+on:
+  push:
+    tags: "*"
+
+jobs:
+  l3build:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install TeX Live
+        uses: zauguin/install-texlive@v3
+        with:
+          package_file: .github/install-texlive@v3
+      - name: Run l3build
+        run: l3build ctan --show-log-on-error -H
+      - name: Upload package artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: Package
+          path: "build/distrib/ctan/*.zip"
+
+  github:
+    runs-on: ubuntu-22.04
+    needs:
+      - l3build
+    steps:
+      - name: Download package artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: Package
+      - name: Create GitHub release
+        uses: ncipollo/release-action@2c591bcc8ecdcd2db72b97d6147f871fcd833ba5
+        with:
+          artifacts: "build/distrib/ctan/*.zip"
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  ctan-validate:
+    runs-on: ubuntu-22.04
+    needs:
+      - l3build
+    steps:
+      - name: Download package artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: Package
+      - name: Upload CTAN package
+        uses: zauguin/[email protected]
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          package-name: lua-ul
+          version: ${{ github.ref_name }}
+          author: Marcel Krüger
+          uploader: Dummy Name
+          email: [email protected]
+          license: lppl1.3c
+          summary: Underlining for LuaLaTeX
+          ctan-path: /macros/luatex/latex/lua-ul
+          update: true
+          topics: [underline, luatex]
+          description: |
+             This package provides underlining, strikethough, and highlighting using features in LuaLaTeX which avoid the restrictions imposed by other methods. In particular, kerning is not affected, the underlined text can use arbitrary commands, hyphenation works etc.
+
+             The package requires LuaTeX version ≥ 1.12.0. 
+          filename: build/distrib/ctan/lua-ul.zip
+          dry-run: true