Sets up as a very basic GitHub Action

Dockerfile

@@ -0,0 +1,8 @@
+FROM php:8.2-cli-alpine
+
+RUN apk add --no-cache bash
+
+ADD cs2pr /usr/local/bin
+ADD action-entrypoint.sh /usr/local/bin
+
+ENTRYPOINT ["action-entrypoint.sh"]

action-entrypoint.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+FLAGS=()
+
+[[ -n "$CS2PR_GRACEFUL_WARNINGS" ]] && FLAGS+=("--graceful-warnings")
+[[ -n "$CS2PR_COLORIZE" ]] && FLAGS+=("--colorize")
+[[ -n "$CS2PR_NOTICES_AS_WARNINGS" ]] && FLAGS+=("--notices-as-warnings")
+[[ -n "$CS2PR_ERRORS_AS_WARNINGS" ]] && FLAGS+=("--errors-as-warnings")
+[[ -n "$CS2PR_PREPEND_FILENAME" ]] && FLAGS+=("--prepend-filename")
+[[ -n "$CS2PR_PREPEND_SOURCE" ]] && FLAGS+=("--prepend-source")
+
+IFS=";" read -r -a FILES <<< "$CS2PR_FILES"
+
+cs2pr "${FLAGS[@]}" "${FILES[@]}"

action.yml

@@ -0,0 +1,49 @@
+name: cs2pr
+description: Convert checkstyle XML to GitHub PR annotations
+
+inputs:
+  graceful-warnings:
+    description: Don't exit with error codes if there are only warnings
+    required: false
+    default: ""
+  colorize:
+    description: Colorize the output (still compatible with Github Annotations)
+    required: false
+    default: ""
+  notices-as-warnings:
+    description: Convert notices to warnings (Github does not annotate notices otherwise)
+    required: false
+    default: ""
+  errors-as-warnings: 
+    description: Downgrade errors to warnings
+    required: false
+    default: ""
+  prepend-filename:
+    description: Prepend error 'filename' attribute to the message
+    required: false
+    default: ""
+  prepend-source:
+    description: Prepend error 'source' attribute to the message
+    required: false
+    default: ""
+  files:
+    description: The checkstyle XML files to convert to GitHub PR annotations separated by semicolons
+    required: true
+
+outputs: {}
+
+runs:
+  using: docker
+  image: Dockerfile
+  env:
+    CS2PR_GRACEFUL_WARNINGS: ${{ inputs.graceful-warnings }}
+    CS2PR_COLORIZE: ${{ inputs.colorize }}
+    CS2PR_NOTICES_AS_WARNINGS: ${{ inputs.notices-as-warnings }}
+    CS2PR_ERRORS_AS_WARNINGS: ${{ inputs.errors-as-warnings }}
+    CS2PR_PREPEND_FILENAME: ${{ inputs.prepend-filename }}
+    CS2PR_PREPEND_SOURCE: ${{ inputs.prepend-source }}
+    CS2PR_FILES: ${{ inputs.files }}
+
+branding:
+  icon: "file"
+  color: "purple"