ci(release): Switch from action-prepare-release to Craft

This PR migrates from the deprecated action-prepare-release to the new
Craft GitHub Actions (reusable workflow or composite action).

Changes:
- Migrate .github/workflows/release_library.yml to Craft reusable workflow

Author: BYK

.github/workflows/changelog-preview.yml

@@ -0,0 +1,13 @@
+name: Changelog Preview
+on:
+  pull_request:
+    types:
+    - opened
+    - synchronize
+    - reopened
+    - edited
+    - labeled
+jobs:
+  changelog-preview:
+    uses: getsentry/craft/.github/workflows/changelog-preview.yml@v2
+    secrets: inherit

.github/workflows/release_library.yml

@@ -1,38 +1,18 @@
 name: Release Library
-
 on:
   workflow_dispatch:
     inputs:
       version:
-        description: Version to release
-        required: true
+        description: Version to release (or "auto")
+        required: false
       force:
-        description: Force a release even when there are release-blockers (optional)
+        description: Force a release even when there are release-blockers
         required: false
-
 jobs:
   release:
-    runs-on: ubuntu-latest
-    name: "Release a new librelay version"
-
-    steps:
-      - name: Get auth token
-        id: token
-        uses: actions/create-github-app-token@29824e69f54612133e76f7eaac726eef6c875baf # v2.2.1
-        with:
-          app-id: ${{ vars.SENTRY_RELEASE_BOT_CLIENT_ID }}
-          private-key: ${{ secrets.SENTRY_RELEASE_BOT_PRIVATE_KEY }}
-
-      - uses: actions/checkout@v6.0.1
-        with:
-          token: ${{ steps.token.outputs.token }}
-          fetch-depth: 0
-
-      - name: Prepare release
-        uses: getsentry/action-prepare-release@v1
-        env:
-          GITHUB_TOKEN: ${{ steps.token.outputs.token }}
-        with:
-          version: ${{ github.event.inputs.version }}
-          force: ${{ github.event.inputs.force }}
-          path: py
+    uses: getsentry/craft/.github/workflows/release.yml@v2
+    with:
+      version: ${{ inputs.version }}
+      force: ${{ inputs.force }}
+      path: py
+    secrets: inherit