ci: release + changelogs automation (#160)

Author: tulayha

.github/release-please/release-please-config.json

@@ -0,0 +1,39 @@
+{
+  "include-component-in-tag": false,
+  "include-v-in-tag": true,
+  "release-as": "1.5.5",
+  "pull-request-title-pattern": "chore${scope}: release${component} ${version} [release-please]",
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "package-name": "playroom-unity",
+      "changelog-path": "CHANGELOG.md",
+      "changelog-sections": [
+        {
+          "type": "feat",
+          "section": "Features"
+        },
+        {
+          "type": "fix",
+          "section": "Bug Fixes"
+        },
+        {
+          "type": "perf",
+          "section": "Performance"
+        },
+        {
+          "type": "refactor",
+          "section": "Refactors"
+        },
+        {
+          "type": "revert",
+          "section": "Reverts"
+        }
+      ],
+      "extra-files": [
+        "Packages/com.playroomkit.sdk/package.json",
+        "Tools/playroomkit-js/package.json"
+      ]
+    }
+  }
+}

.github/release-please/release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "1.5.4"
+}

.github/workflows/release-please.yaml

@@ -0,0 +1,26 @@
+name: Release + Changelog Automation [release-please]
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          config-file: .github/release-please/release-please-config.json
+          manifest-file: .github/release-please/release-please-manifest.json