feat: initial action implementation (#1)

.github/workflows/grit-check.yaml

@@ -0,0 +1,21 @@
+name: grit-check-pre-release
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - '*'
+  workflow_dispatch: {}
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: grit-check
+        uses: ./
+        with:
+          args: '.github'

.grit/.gitignore

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+.gritmodules
+*.log

.grit/grit.yaml

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+version: 0.0.1
+patterns:
+  - name: github.com/getgrit/stdlib#*
+  - name: use_ubuntu
+    description: 'This is a no-op warning meant for testing. You can ignore it.'
+    level: warn
+    body: |
+      language yaml
+      `runs-on: ubuntu-latest` => `runs-on: "ubuntu-latest"`

README.md

@@ -1 +1,57 @@
-# github-action-check
+# Grit GitHub Action
+
+This action runs the Grit CLI to report any violations of your configured [Grit patterns](https://docs.grit.io/guides/config).
+
+## Usage
+
+You can add it as a step in your GitHub Actions workflow to automatically check for violations on every push:
+
+```
+  - name: Grit
+    uses: getgrit/github-action-check@v0
+    with:
+      # Optional additional arguments to pass to the `grit check` command
+      args: ''
+```
+
+## Inputs
+
+### `args`
+Specify [additional arguments](https://docs.grit.io/cli/reference#grit-check) to pass to the `grit check` command.
+
+By default, only warning and error patterns are reported. To include info patterns, use `--level`.
+
+```
+  - name: Grit
+    uses: getgrit/github-action-check@v0
+    with:
+      args: '--level info'
+```
+
+## Example workflow
+
+```
+name: grit-check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: grit-check
+        uses: getgrit/github-action-check@v0
+```
+
+## License
+This action code is released under the [MIT License](LICENSE).
+
+The Grit CLI is not included in this repository and is licensed separately.

action.yaml

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+# Copyright (c) Iuvo AI, Inc.
+# SPDX-License-Identifier: MIT
+#
+name: 'Grit Check'
+description: 'Run Grit checks via GitHub actions'
+inputs:
+  args:
+    description: 'Optional additional arguments to `grit check`'
+    required: false
+    default: ''
+runs:
+    using: 'composite'
+    steps:
+      - name: install grit
+        shell: bash
+        id: download
+        run: |
+          curl -fsSL https://docs.grit.io/install | bash
+      - name: init grit
+        id: init
+        shell: bash
+        run: |
+          grit init
+      - name: run grit check
+        id: check
+        shell: bash
+        run: |
+          grit check --github-actions ${{ inputs.args }}