chore: add release-please workflow for automated releases

Automates version bumping, changelog generation, and crates.io
publishing. The workflow maintains a release PR that tracks
conventional commits since the last release. Merging the PR creates
a GitHub Release with tag and publishes to crates.io.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Frando

.github/workflows/release-please.yml

@@ -0,0 +1,35 @@
+name: Release
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      tag_name: ${{ steps.release.outputs.tag_name }}
+    steps:
+      - uses: googleapis/release-please-action@v4
+        id: release
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  publish:
+    needs: release-please
+    if: ${{ needs.release-please.outputs.release_created }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Publish patchbay to crates.io
+        run: cargo publish -p patchbay
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "0.4.0"
+}

release-please-config.json

@@ -0,0 +1,16 @@
+{
+  "packages": {
+    ".": {
+      "release-type": "rust",
+      "component": "patchbay",
+      "changelog-path": "CHANGELOG.md",
+      "bump-minor-pre-major": true,
+      "bump-patch-for-minor-pre-major": true,
+      "extra-files": [
+        "Cargo.lock",
+        "patchbay/Cargo.toml"
+      ]
+    }
+  },
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
+}