feat: add release-please workflow

This adds a workflow to automatically generate release PRs using
release-please. The workflow is triggered on push to the main branch
and will generate a PR with the release notes for the changes since
the last release.

Refs: #23
Signed-off-by: Jaremy Hatler <hatler.jaremy@gmail.com>

.github/workflows/release-please.yml

@@ -0,0 +1,23 @@
+name: release-please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+  id-token: write
+  packages: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    environment: main
+    steps:
+      - name: Process Release
+        uses: google-github-actions/release-please-action@v3
+        id: release
+        with:
+          command: manifest

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "0.0.1"
+}

release-please-config.json

@@ -0,0 +1,31 @@
+{
+  "plugins": [
+    "sentence-case"
+  ],
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": true,
+  "bootstrap-sha": "c3c2168fc215a14e8fb1a4b1ebd4c3d7a6614c7b",
+  "changelog-sections": [
+    { "type": "feat", "section": "Features" },
+    { "type": "feature", "section": "Features" },
+    { "type": "fix", "section": "Bug Fixes" },
+    { "type": "perf", "section": "Performance Improvements" },
+    { "type": "revert", "section": "Reverts" },
+    { "type": "docs", "section": "Documentation" },
+    { "type": "style", "section": "Styles", "hidden": false },
+    { "type": "chore", "section": "Miscellaneous Chores", "hidden": true },
+    { "type": "refactor", "section": "Code Refactoring", "hidden": false },
+    { "type": "test", "section": "Tests", "hidden": true },
+    { "type": "build", "section": "Build System", "hidden": true },
+    { "type": "ci", "section": "Continuous Integration", "hidden": true }
+  ],
+  "include-component-in-tag": true,
+  "include-v-in-tag": true,
+  "initial-version": "0.0.1",
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "package-name": "gentoo-precision-7540"
+    }
+  }
+}