chore(CI): Add release workflows

Signed-off-by: Thomas von Deyen <thomas@vondeyen.com>

Author: tvdeyen

.github/workflows/post-release.yml

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+name: Post Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      target_branch:
+        description: 'Target branch (e.g., main, 8.0-stable)'
+        required: true
+        default: 'main'
+        type: string
+  repository_dispatch:
+    types: [post-release]
+
+jobs:
+  post-release:
+    uses: AlchemyCMS/.github/.github/workflows/post-release.yml@main
+    with:
+      version_file_path: lib/alchemy/devise/version.rb
+      target_branch: ${{ github.event.client_payload.target_branch || inputs.target_branch }}
+    secrets:
+      app_id: ${{ vars.ALCHEMY_BOT_APP_ID }}
+      app_private_key: ${{ secrets.ALCHEMY_BOT_APP_PRIVATE_KEY }}
+      slack_webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }}
+      mastodon_access_token: ${{ secrets.MASTODON_ACCESS_TOKEN }}
+      mastodon_instance: ${{ secrets.MASTODON_INSTANCE }}
+      bluesky_identifier: ${{ secrets.BLUESKY_IDENTIFIER }}
+      bluesky_password: ${{ secrets.BLUESKY_PASSWORD }}

.github/workflows/prepare-release.yml

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+name: Prepare Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      bump:
+        description: 'Version bump type. Choose "release" for finalizing a pre-release (8.0.0.dev → 8.0.0), or patch/minor/major to simply bump version.'
+        required: true
+        type: choice
+        default: 'patch'
+        options:
+          - release
+          - patch
+          - minor
+          - major
+
+jobs:
+  prepare:
+    uses: AlchemyCMS/.github/.github/workflows/prepare-release.yml@main
+    with:
+      version_file_path: lib/alchemy/devise/version.rb
+      bump: ${{ inputs.bump }}
+    secrets:
+      app_id: ${{ vars.ALCHEMY_BOT_APP_ID }}
+      app_private_key: ${{ secrets.ALCHEMY_BOT_APP_PRIVATE_KEY }}

.github/workflows/release.yml

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+name: Publish Release
+
+on:
+  workflow_dispatch:
+  pull_request:
+    types: [closed]
+    branches:
+      - main
+      - '*-stable'
+
+jobs:
+  publish:
+    if: github.event_name == 'workflow_dispatch' || (github.event.pull_request.merged == true && startsWith(github.event.pull_request.head.ref, 'release/v'))
+    uses: AlchemyCMS/.github/.github/workflows/release.yml@main
+    with:
+      version_file_path: lib/alchemy/devise/version.rb
+      target_branch: ${{ github.event.pull_request.base.ref || github.ref_name }}
+    secrets:
+      app_id: ${{ vars.ALCHEMY_BOT_APP_ID }}
+      app_private_key: ${{ secrets.ALCHEMY_BOT_APP_PRIVATE_KEY }}
+      rubygems_api_key: ${{ secrets.RUBYGEMS_API_KEY }}