Provide CI configurations for GitHub Actions

.github/tl_packages

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+# The test framework itself
+l3build
+#
+# Required to build plain and LaTeX formats
+latex-bin
+luahbtex
+tex
+#
+# Then get the rest of required LaTeX
+amsmath
+tools
+#
+# Assuming a 'basic' font set up, metafont is required to avoid
+# warnings with some packages and errors with others
+metafont
+mfware
+#
+# Dependencies for tests that are not auto-resolved
+bibtex
+biblatex
+biber
+ctablestack
+lualatex-math
+luatexbase
+lua-widow-control
+microtype
+selnolig
+#
+# For the doc target
+adjustbox
+alphalph
+amsfonts
+anonymouspro
+babel
+babel-english
+babel-german
+bookmark
+booktabs
+caption
+catchfile
+cleveref
+colortbl
+csquotes
+dantelogo
+dvips
+ec
+enumitem
+epstopdf
+epstopdf-pkg
+etoolbox
+everysel
+fancyvrb
+fetamont
+fira
+fontspec
+framed
+fvextra
+graphics
+hologo
+hvfloat
+hvlogos
+hypdoc
+hyperref
+ifoddpage
+inconsolata
+libertine
+libertinus
+libertinus-fonts
+libertinus-type1
+libertinus-otf
+lineno
+listings
+makeindex
+marginnote
+mathpazo
+metalogo
+multido
+oberdiek
+pgf
+picture
+psnfss
+ragged2e
+siunitx
+sttools
+times
+underscore
+unicode-math
+units
+upquote
+varwidth
+xcolor
+xits

.github/workflows/main.yaml

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+name: Automated testing
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  l3build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install TeX Live
+        uses: zauguin/install-texlive@v2
+        with:
+          # List the required TeX Live packages in a separate file to allow
+          # reuse in different workflows.
+          package_file: .github/tl_packages
+
+      - name: Run l3build
+        run: l3build ctan -q -H

.github/workflows/release.yaml

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+name: Create release
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    name: Build release
+    environment: Release
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: Install TeX Live
+        uses: zauguin/install-texlive@v2
+        with:
+          # List the required TeX Live packages in a separate file to allow
+          # reuse in different workflows.
+          package_file: .github/tl_packages
+
+      - name: Run l3build
+        run: l3build ctan -q -H
+
+      - name: Create GitHub release
+        uses: ncipollo/release-action@a2e71bdd4e7dab70ca26a852f29600c98b33153e # v1.12.0
+        id: release
+        with:
+          artifacts: "build/distrib/ctan/*.zip"