add release-plan (#57)

.github/workflows/plan-release.yml

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+name: Release Plan Review
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request_target: # This workflow has permissions on the repo, do NOT run code from PRs in this workflow. See https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+    types:
+      - labeled
+      - unlabeled
+
+concurrency:
+  group: plan-release # only the latest one of these should ever be running
+  cancel-in-progress: true
+
+jobs:
+  check-plan:
+    name: "Check Release Plan"
+    runs-on: ubuntu-latest
+    outputs:
+      command: ${{ steps.check-release.outputs.command }}
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: 'master'
+      # This will only cause the `check-plan` job to have a "command" of `release`
+      # when the .release-plan.json file was changed on the last commit.
+      - id: check-release
+        run: if git diff --name-only HEAD HEAD~1 | grep -w -q ".release-plan.json"; then echo "command=release"; fi >> $GITHUB_OUTPUT
+
+  prepare_release_notes:
+    name: Prepare Release Notes
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    needs: check-plan
+    permissions:
+      contents: write
+      pull-requests: write
+    outputs:
+      explanation: ${{ steps.explanation.outputs.text }}
+    # only run on push event if plan wasn't updated (don't create a release plan when we're releasing)
+    # only run on labeled event if the PR has already been merged
+    if: (github.event_name == 'push' && needs.check-plan.outputs.command != 'release') || (github.event_name == 'pull_request_target' && github.event.pull_request.merged == true)
+
+    steps:
+      - uses: actions/checkout@v4
+        # We need to download lots of history so that
+        # github-changelog can discover what's changed since the last release
+        with:
+          fetch-depth: 0
+          ref: 'master'
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+
+      - run: npm ci
+
+      - name: "Generate Explanation and Prep Changelogs"
+        id: explanation
+        run: |
+          set +e
+          
+          npx release-plan prepare 2> >(tee -a release-plan-stderr.txt >&2)
+          
+
+          if [ $? -ne 0 ]; then
+            echo 'text<<EOF' >> $GITHUB_OUTPUT
+            cat release-plan-stderr.txt >> $GITHUB_OUTPUT
+            echo 'EOF' >> $GITHUB_OUTPUT
+          else
+            echo 'text<<EOF' >> $GITHUB_OUTPUT
+            jq .description .release-plan.json -r >> $GITHUB_OUTPUT
+            echo 'EOF' >> $GITHUB_OUTPUT
+            rm release-plan-stderr.txt
+          fi
+        env:
+          GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: peter-evans/create-pull-request@v6
+        with:
+          commit-message: "Prepare Release using 'release-plan'"
+          labels: "internal"
+          branch: release-preview
+          title: Prepare Release
+          body: |
+            This PR is a preview of the release that [release-plan](https://github.com/embroider-build/release-plan) has prepared. To release you should just merge this PR 👍
+
+            -----------------------------------------
+
+            ${{ steps.explanation.outputs.text }}

.github/workflows/publish.yml

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+# For every push to the master branch, this checks if the release-plan was
+# updated and if it was it will publish stable npm packages based on the
+# release plan
+
+name: Publish Stable
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+      - master
+
+concurrency:
+  group: publish-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check-plan:
+    name: "Check Release Plan"
+    runs-on: ubuntu-latest
+    outputs:
+      command: ${{ steps.check-release.outputs.command }}
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: 'master'
+      # This will only cause the `check-plan` job to have a result of `success`
+      # when the .release-plan.json file was changed on the last commit. This
+      # plus the fact that this action only runs on main will be enough of a guard
+      - id: check-release
+        run: if git diff --name-only HEAD HEAD~1 | grep -w -q ".release-plan.json"; then echo "command=release"; fi >> $GITHUB_OUTPUT
+
+  publish:
+    name: "NPM Publish"
+    runs-on: ubuntu-latest
+    needs: check-plan
+    if: needs.check-plan.outputs.command == 'release'
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          # This creates an .npmrc that reads the NODE_AUTH_TOKEN environment variable
+          registry-url: 'https://registry.npmjs.org'
+
+      - run: npm ci
+      - name: npm publish
+        run: npx release-plan publish
+
+        env:
+          GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

CHANGELOG.md

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+# Changelog

RELEASE.md

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+# Release Process
+
+Releases in this repo are mostly automated using [release-plan](https://github.com/embroider-build/release-plan/). Once you label all your PRs correctly (see below) you will have an automatically generated PR that updates your CHANGELOG.md file and a `.release-plan.json` that is used to prepare the release once the PR is merged.
+
+## Preparation
+
+Since the majority of the actual release process is automated, the remaining tasks before releasing are: 
+
+-  correctly labeling **all** pull requests that have been merged since the last release
+-  updating pull request titles so they make sense to our users
+
+Some great information on why this is important can be found at [keepachangelog.com](https://keepachangelog.com/en/1.1.0/), but the overall
+guiding principle here is that changelogs are for humans, not machines.
+
+When reviewing merged PR's the labels to be used are:
+
+* breaking - Used when the PR is considered a breaking change.
+* enhancement - Used when the PR adds a new feature or enhancement.
+* bug - Used when the PR fixes a bug included in a previous release.
+* documentation - Used when the PR adds or updates documentation.
+* internal - Internal changes or things that don't fit in any other category.
+
+**Note:** `release-plan` requires that **all** PRs are labeled. If a PR doesn't fit in a category it's fine to label it as `internal`
+
+## Release
+
+Once the prep work is completed, the actual release is straight forward: you just need to merge the open [Plan Release](https://github.com/snewcomer/intersection-observer-admin/pulls?q=is%3Apr+is%3Aopen+%22Prepare+Release%22+in%3Atitle) PR