chore: bootstrap releases for 'xdr' gem

.github/release-please-config.json

@@ -0,0 +1,21 @@
+{
+  "release-type": "ruby-yoshi",
+  "draft": true,
+  "prerelease": false,
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": true,
+  "include-component-in-tag": false,
+  "include-v-in-tag": true,
+  "skip-github-release": false,
+  "separate-pull-requests": false,
+  "tag-separator": "/",
+  "sequential-calls": false,
+  "packages": {
+    ".": {
+      "package-name": "xdr",
+      "changelog-path": "CHANGELOG.md",
+      "version-file": "lib/xdr/version.rb"
+    }
+  },
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
+}

.github/release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "3.0.3"
+}

.github/release-please.yml

@@ -0,0 +1,5 @@
+primaryBranch: main
+handleGHRelease: true
+manifest: true
+manifestConfig: .github/release-please-config.json
+manifestFile: .github/release-please-manifest.json

.github/workflows/release-please.yml

@@ -1,17 +1,45 @@
 name: release-please
-
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   workflow_dispatch:
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   release-please:
+    if: ${{ github.repository == 'astroband/ruby-xdr' }}
     runs-on: ubuntu-latest
     steps:
-    - id: release
-      uses: google-github-actions/release-please-action@v3
-      with:
-        release-type: ruby
-        bump-minor-pre-major: true
-        version-file: "lib/xdr/version.rb"
+      - uses: google-github-actions/release-please-action@v4
+        id: release
+        with:
+          token: ${{ secrets.RELEASE_PLEASE_TOKEN }}
+          config-file: .github/release-please-config.json
+          manifest-file: .github/release-please-manifest.json
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      release_tag_name: ${{ steps.release.outputs.tag_name }}
+
+  push-gem:
+    needs: release-please
+    runs-on: ubuntu-latest
+    if: ${{ needs.release-please.outputs.release_created }}
+
+    permissions:
+      contents: write
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ needs.release-please.outputs.release_tag_name }}
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      - uses: rubygems/release-gem@v1