ci: adding release-please (#50)

Using the release process from Google's release-please tooling and workflow.
Google's release-please opens a release pull request, which automates CHANGELOG
generation and version bumps, by parsing git history for Conventional Commit
messages. Upon merging the release pull request a new release is created.

* https://github.com/googleapis/release-please
* https://github.com/googleapis/release-please-action

.github/workflows/release-please.yml

@@ -0,0 +1,19 @@
+name: Continuous Delivery (CD)
+
+on:
+  push:
+    branches:
+      - main
+
+# https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.MY_RELEASE_PLEASE_TOKEN }}

.release-please-manifest.json

@@ -0,0 +1 @@
+{".":"6.0.1"}

release-please-config.json

@@ -0,0 +1,9 @@
+{
+  "changelog-type": "github",
+  "release-type": "rust",
+  "pull-request-title-pattern": "chore: release ${version}",
+  "include-component-in-tag": false,
+  "packages": {
+    ".": {}
+  }
+}