ci: add release job with release-please automation

Add automated release workflow that runs after successful build,
using Google's release-please action for Rust projects.

Signed-off-by: Svetlin Ralchev <iamralch@users.noreply.github.com>

Author: iamralch

.github/workflows/ci.yml

@@ -4,6 +4,10 @@ on:
     branches: ["main"]
   pull_request:
     branches: ["main"]
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
 env:
   CARGO_TERM_COLOR: always
 jobs:
@@ -22,3 +26,10 @@ jobs:
         run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose
+  release:
+    needs: [build]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          release-type: rust