Add basic GitHub Action

Dockerfile

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+FROM alpine:3.19
+
+RUN apk add --no-cache --upgrade \
+    texlive-full
+
+ADD build.sh /
+RUN chmod +x /compile.sh
+
+ENTRYPOINT ["/compile.sh"]

README.md

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+# TeXLive Action
+
+Based on [TeXLive Action](https://github.com/repaction/texlive).
+
+Example usage:
+
+```yaml
+name: Compile and deploy TeX documents
+run-name: Compile and deploy TeX documents
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build_tex:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Compile TeX documents
+        uses: https://git.roy.lv/actions/texlive-action # Full URL is Gitea Actions specific
+        with:
+          tex_files: >-
+            file1.tex
+            file2.tex
+          compiler: xelatex
+          options: ''
+```

action.yml

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+name: TeXLive Action
+description: Compile TeX documents into PDF with TeXLive
+branding:
+  icon: printer
+  color: blue
+inputs:
+  files:
+    description: TeX files to be compiled.
+    required: true
+  compiler:
+    description: The TeX engine to be used.
+    default: xelatex
+  options:
+    description: Arguments to be passed to the TeX compiler
+    default: ''
+runs:
+  using: docker
+  image: Dockerfile
+  args:
+    - ${{ inputs.files }}
+    - ${{ inputs.compiler }}
+    - ${{ inputs.options }}

compile.sh

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+#!/bin/sh
+
+set -euo pipefail
+
+files="$1"
+compiler="$2"
+options="$3"
+
+for f in $files; do
+  if [-f "$f" ]; then
+      echo "Compiling '$f'.."
+      $compiler $options $f
+      $compiler $options $f # Run twice to make sure everything is OK
+  else
+    echo "'$f' not found!"
+  fi
+done