Add action and continuous integration infrastructure

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      actions:
+        patterns:
+          - "*"

.github/workflows/check-commit-message.yml

@@ -0,0 +1,27 @@
+name: "Commit Message Check"
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - reopened
+      - synchronize
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  check-commit-message:
+    runs-on: ubuntu-latest
+    steps:
+      # Check out the repository to ensure the step below has access to action source code.
+      - uses: actions/checkout@v4
+
+      # Run the commit message validation action using the source code checked out in the previous step.
+      - uses: ./
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  pre-commit:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - uses: pre-commit/[email protected]
+
+  test-action:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.pre-commit-config.yaml

@@ -0,0 +1,27 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: "v4.5.0"
+    hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: check-yaml
+      - id: debug-statements
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: trailing-whitespace
+
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: "v3.1.0"
+    hooks:
+      - id: prettier
+        types_or: [yaml, markdown, html, css, scss, javascript, json]
+        args: [--prose-wrap=always]
+
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: "0.28.0"
+    hooks:
+      - id: check-dependabot
+      - id: check-github-actions
+      - id: check-github-workflows

README.md

@@ -3,3 +3,44 @@
 This GitHub composite action verifies that commit messages conform to the
 [Slicer commit style](https://slicer.readthedocs.io/en/latest/developer_guide/style_guide.html#commits)
 guidelines.
+
+## Usage
+
+To automatically enforce the Slicer commit message style during pull requests or
+pushes to the `main` branch, create a workflow file at
+`.github/workflows/check-commit-message.yml` with the following content:
+
+```yaml
+name: "Commit Message Check"
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - reopened
+      - synchronize
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  check-commit-message:
+    name: Check Commit Message
+    uses: slicer/[email protected]
+    with:
+      token: ${{ secrets.GITHUB_TOKEN }}
+```
+
+This workflow will trigger commit message checks on relevant pull request events
+or when changes are pushed to the `main` branch.
+
+## History
+
+This action was originally implemented by
+[@jamesobutler](https://github.com/jamesobutler),
+[@pieper](https://github.com/pieper) and [@jcfr](https://github.com/jcfr) in the
+Slicer repository under `.github/workflows/commit-message.yml`.

action.yml

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+name: "Commit Message Check"
+description: "Check Commit Messages match Slicer style"
+inputs:
+  token:
+    description:
+      "GitHub access token used to list and check all pull request commits"
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - name: Check Commit Prefix
+      uses: gsactions/commit-message-checker@16fa2d5de096ae0d35626443bcd24f1e756cafee # v2.0.0
+      with:
+        pattern: "^(ENH|PERF|BUG|STYLE|DOC|COMP): ([A-Z])+"
+        flags: "gm"
+        excludeDescription: "true" # optional: this excludes the description body of a pull request
+        excludeTitle: "true" # optional: this excludes the title of a pull request
+        error:
+          'The first line has to start with a commit prefix, followed by a colon
+          and space, and then followed by a message with a capital letter (e.g
+          "ENH: Add support for awesome feature"). For more details on other
+          requirements, see
+          https://slicer.readthedocs.io/en/latest/developer_guide/style_guide.html#commits'
+        checkAllCommitMessages: "true" # optional: this checks all commits associated with a pull request
+        accessToken: ${{ inputs.token }} # github access token is only required if checkAllCommitMessages is true
+
+    - name: Check Line Length
+      uses: gsactions/commit-message-checker@16fa2d5de096ae0d35626443bcd24f1e756cafee # v2.0.0
+      with:
+        pattern: "^[^#].{1,78}$"
+        error:
+          "The maximum line length of 78 characters is exceeded. For more
+          details, see
+          https://slicer.readthedocs.io/en/latest/developer_guide/style_guide.html#commits"
+        excludeDescription: "true" # optional: this excludes the description body of a pull request
+        excludeTitle: "true" # optional: this excludes the title of a pull request
+        checkAllCommitMessages: "true" # optional: this checks all commits associated with a pull request
+        accessToken: ${{ inputs.token }} # github access token is only required if checkAllCommitMessages is true