chore: add Semver Workflow for automated releases

See https://github.com/sanity-io/plugin-kit/blob/main/docs/semver-workflow.md#preset-semver-workflow

.github/workflows/main.yml

@@ -0,0 +1,126 @@
+---
+name: CI & Release
+
+# Workflow name based on selected inputs. Fallback to default Github naming when expression evaluates to empty string
+run-name: >-
+  ${{
+    inputs.release && inputs.test && format('Build {0} ➤ Test ➤ Publish to NPM', github.ref_name)  ||
+    inputs.release && !inputs.test && format('Build {0} ➤ Skip Tests ➤ Publish to NPM', github.ref_name) ||
+    github.event_name == 'workflow_dispatch' && inputs.test && format('Build {0} ➤ Test', github.ref_name) ||
+    github.event_name == 'workflow_dispatch' && !inputs.test && format('Build {0} ➤ Skip Tests', github.ref_name) ||
+    ''
+  }}
+
+on:
+  # Build on pushes branches that have a PR (including drafts)
+  pull_request:
+  # Build on commits pushed to branches without a PR if it's in the allowlist
+  push:
+    branches: [main]
+  # https://docs.github.com/en/actions/managing-workflow-runs/manually-running-a-workflow
+  workflow_dispatch:
+    inputs:
+      test:
+        description: Run tests
+        required: true
+        default: true
+        type: boolean
+      release:
+        description: Release new version
+        required: true
+        default: false
+        type: boolean
+
+concurrency:
+  # On PRs builds will cancel if new pushes happen before the CI completes, as it defines `github.head_ref` and gives it the name of the branch the PR wants to merge into
+  # Otherwise `github.run_id` ensures that you can quickly merge a queue of PRs without causing tests to auto cancel on any of the commits pushed to main.
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read # for checkout
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Lint & Build
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          cache: npm
+          node-version: lts/*
+      - run: npm clean-install
+        # Linting can be skipped
+      - run: npm run lint --if-present
+        if: github.event.inputs.test != 'false'
+        # But not the build script, as semantic-release will crash if this command fails so it makes sense to test it early
+      - run: npm run prepublishOnly --if-present
+
+  test:
+    needs: build
+    # The test matrix can be skipped, in case a new release needs to be fast-tracked and tests are already passing on main
+    if: github.event.inputs.test != 'false'
+    runs-on: ${{ matrix.os }}
+    name: Node.js ${{ matrix.node }} / ${{ matrix.os }}
+    strategy:
+      # A test failing on windows doesn't mean it'll fail on macos. It's useful to let all tests run to its completion to get the full picture
+      fail-fast: false
+      matrix:
+        # Run the testing suite on each major OS with the latest LTS release of Node.js
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        node: [lts/*]
+        # It makes sense to also test the oldest, and latest, versions of Node.js, on ubuntu-only since it's the fastest CI runner
+        include:
+          - os: ubuntu-latest
+            # Test the oldest LTS release of Node that's still receiving bugfixes and security patches, versions older than that have reached End-of-Life
+            node: lts/-1
+          - os: ubuntu-latest
+            # Test the actively developed version that will become the latest LTS release next October
+            node: current
+    steps:
+      # It's only necessary to do this for windows, as mac and ubuntu are sane OS's that already use LF
+      - name: Set git to use LF
+        if: matrix.os == 'windows-latest'
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          cache: npm
+          node-version: ${{ matrix.node }}
+      - run: npm install
+      - run: npm test --if-present
+
+  release:
+    permissions:
+      contents: write # to be able to publish a GitHub release
+      issues: write # to be able to comment on released issues
+      pull-requests: write # to be able to comment on released pull requests
+      id-token: write # to enable use of OIDC for npm provenance
+    needs: [build, test]
+    # only run if opt-in during workflow_dispatch
+    if: always() && github.event.inputs.release == 'true' && needs.build.result != 'failure' && needs.test.result != 'failure' && needs.test.result != 'cancelled'
+    runs-on: ubuntu-latest
+    name: Semantic release
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # Need to fetch entire commit history to
+          # analyze every commit since last release
+          fetch-depth: 0
+      - uses: actions/setup-node@v4
+        with:
+          cache: npm
+          node-version: lts/*
+      - run: npm clean-install
+      - run: npm audit signatures
+        # Branches that will release new versions are defined in .releaserc.json
+      - run: npx semantic-release
+        # Don't allow interrupting the release step if the job is cancelled, as it can lead to an inconsistent state
+        # e.g. git tags were pushed but it exited before `npm publish`
+        if: always()
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_PUBLISH_TOKEN }}

.husky/commit-msg

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx --no -- commitlint --edit ""

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx lint-staged

.releaserc.json

@@ -0,0 +1,4 @@
+{
+  "extends": "@sanity/semantic-release-preset",
+  "branches": ["main"]
+}

README.md

@@ -15,7 +15,7 @@ Current available checks include:
 ## Installation
 
 ```sh
-npm install sanity-plugin-preflight
+npm install @planetary/sanity-plugin-preflight
 ```
 
 ## Usage
@@ -25,7 +25,7 @@ If you don't have a custom Structure Builder configuration, please see [the offi
 
 ```ts
 // deskStructure.ts
-import {Preflight, DeadLinks} from 'sanity-plugin-preflight'
+import {Preflight, DeadLinks} from '@planetary/sanity-plugin-preflight'
 import {RocketIcon} from '@sanity/icons'
 
 export const getDefaultDocumentNode = ({schemaType}) => {
@@ -52,14 +52,21 @@ export const getDefaultDocumentNode = ({schemaType}) => {
 }
 ```
 
-## License
-
-[MIT](LICENSE) © [Planetary Corporation](https://planetary.co)
-
 ## Develop & test
 
 This plugin uses [@sanity/plugin-kit](https://github.com/sanity-io/plugin-kit)
 with default configuration for build & watch scripts.
 
 See [Testing a plugin in Sanity Studio](https://github.com/sanity-io/plugin-kit#testing-a-plugin-in-sanity-studio)
 on how to run this plugin with hotreload in the studio.
+
+### Release new version
+
+Run ["CI & Release" workflow](https://github.com/planetary/sanity-plugin-preflight/actions/workflows/main.yml).
+Make sure to select the main branch and check "Release new version".
+
+Semantic release will only release on configured branches, so it is safe to run release on any branch.
+
+## License
+
+[MIT](LICENSE) © [Planetary Corporation](https://planetary.co)

commitlint.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+}

lint-staged.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  '**/*.{js,jsx}': ['eslint'],
+  '**/*.{ts,tsx}': ['eslint', () => 'tsc --build'],
+}