Fix and clarify workflow logic, add branch versioning

- `pr.yml` should've been deleted a long time ago. Its functionality
  was already elsewhere, and that's since been folded into `test.yml`.
- I added automatic `release-v*` and `main-v*` versioning.
- Renamed `merge.yml` to `push-release.yml` and `push-main.yml` to
  `pr-create-release.yml` so it's clearer what they're actually
  listening to. I also modified their display names.

.github/workflows/pr-create-release.yml

@@ -1,4 +1,4 @@
-name: Warn on pushing to `release`
+name: Warn on opening a PR to `release`
 on:
   pull_request_target:
     types: [opened]

.github/workflows/pr.yml

@@ -1,31 +0,0 @@
-name: pr
-
-on:
-  push:
-    branches: [ main ]
-
-  workflow_dispatch:
-
-concurrency: prr:pre-release
-
-jobs:
-  pr:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
-      with:
-        node-version: 20
-    - run: npm ci
-    - run: npm run build
-    - run: npx pr-release pr --verbose --target release --source main --compact --verbose --minimize-semver-change
-      env:
-        GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
-    # The following will publish a prerelease to npm
-    - run: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/.npmrc
-      name: Setup NPM Auth
-      env:
-        NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
-    - run: npx pr-release infer-prerelease --preid=next --target release --source main --verbose --publish --minimize-semver-change
-      name: Publish

.github/workflows/push-release.yml

@@ -1,12 +1,11 @@
-name: merge
+name: Create release when pushing to `release`
 
 on:
   push:
-    branches: [ release ]
+    branches: [release]
-
   workflow_dispatch:
 
-concurrency: prr:deploy
+concurrency: merge-release
 
 jobs:
   merge:
@@ -24,7 +23,7 @@ jobs:
     - run: npx pr-release merge --target release --source main --commit --force --clean --changelog ./docs/recent-changes.md --compact --minimize-semver-change
       env:
         GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
-
+    - run: bash scripts/set-versioned-branch.sh release
     # The following will publish the release to npm
     - run: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/.npmrc
       name: Setup NPM Auth

.github/workflows/rollback.yml

@@ -19,3 +19,4 @@ jobs:
     - run: npx pr-release rollback --verbose --target release --source main --verbose --ignore 'package*' --ignore docs/changelog.md --ignore docs/recent-changes.md
       env:
         GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+    - run: bash scripts/set-versioned-branch.sh release

scripts/set-versioned-branch.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+base="$1"
+
+if [[ -z "$base" ]]; then
+    echo '::error::Base branch is missing. Invoke as `bash scripts/set-versioned-branch.sh BASE' >&2
+    exit 1
+fi
+
+major=$(node -pe 'require("./package.json").version.replace(/\..*$/,"")')
+# Can't do a force push due to branch protection rules.
+git checkout "${base}"
+git checkout -B "${base}-v${major}"
+git push origin "${base}-v${major}"