feat(release): support alpha releases (#1224)

* feat(release): support alpha releases

Node.js 27 introduces Alpha releases versioned as
vN.0.0-alpha.X.Y.Z (see nodejs/node#63135). Teach `git node release`
about them:

- --prepare detects alpha release lines from the NODE_ALPHA_*_VERSION
  macros in src/node_version.h, computes the next alpha version from
  the semver labels of the commits, and accepts
  --newVersion=N.0.0-alpha.X.Y.Z.
- When CHANGELOG_V{N}.md does not exist yet, --prepare creates it,
  updates the navigation of the other changelogs and the root
  CHANGELOG.md, and groups the commit list by semver-major, minor and
  patch.
- --newVersion=N.0.0 on an alpha release line prepares the first
  stable release, removing the alpha macros and relabelling Alpha
  entries as Current.
- --promote validates "(Alpha)" release commits, creates their GitHub
  releases as pre-releases, and, when promoting N.0.0, bumps main to
  N+1 with the alpha macros reset to 0.
- Fix the "Working on" commit corrupting node_version.h when the patch
  version goes from 9 to 10.

Refs: nodejs/Release#1187
Signed-off-by: RafaelGSS <rafael.nunu@hotmail.com>

* fixup! feat(release): support alpha releases

Signed-off-by: RafaelGSS <rafael.nunu@hotmail.com>

---------

Signed-off-by: RafaelGSS <rafael.nunu@hotmail.com>

Author: RafaelGSS

components/git/release.js

@@ -85,6 +85,8 @@ export function builder(yargs) {
       'Prepare a new security release of Node.js with auto-determined version')
     .example('git node release --prepare --newVersion=1.2.3',
       'Prepare a new release of Node.js tagged v1.2.3')
+    .example('git node release --prepare --newVersion=27.0.0-alpha.0.0.0',
+      'Prepare the first Alpha release of Node.js 27')
     .example('git node release --promote https://github.com/nodejs/node/pull/12345 https://github.com/nodejs/node/pull/54321',
       'Promote two prepared releases of Node.js with PR #12345 and #54321')
     .example('git node --prepare --startLTS',

docs/git-node.md

@@ -243,6 +243,17 @@ git node release --prepare 1.2.3
 git node release --prepare
 ```
 
+```sh
+# Prepare the first Alpha release of a new release line
+git node release --prepare 27.0.0-alpha.0.0.0
+```
+
+```sh
+# Prepare the semver-major release of an Alpha release line, which marks it
+# as out of Alpha.
+git node release --prepare 27.0.0
+```
+
 ```sh
 # Prepare the first LTS release for a given release line
 git node release --prepare --startLTS