Configure GitHub Action

Dockerfile

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+FROM bash:5
+COPY entrypoint.sh /
+COPY problem-matcher.json /
+COPY splinter /
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'Splinter'
+description: 'Simple pattern-based linter'
+inputs:
+  rules_file:
+    description: 'Rules file path'
+    required: true
+    default: '.splinter'
+  src_paths:
+    description: 'List of files/directories to lint'
+    required: false
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.rules_file }}
+    - ${{ inputs.src_paths }}

entrypoint.sh

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+#!/usr/bin/env bash
+
+cp /problem-matcher.json $HOME
+echo "::add-matcher::$HOME/problem-matcher.json"
+/splinter "$@"

problem-matcher.json

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+{
+  "problemMatcher": [
+    {
+      "owner": "splinter",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):(.+)$",
+          "file": 1,
+          "line": 2,
+          "message": 3
+        }
+      ]
+    }
+  ]
+}