Introduce github workflow to publish cargo crate (#141)

.github/workflows/publish.yml

@@ -0,0 +1,22 @@
+name: Publish
+
+on:
+  release:
+    types: [published]
+
+permissions: read-all
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  publish:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Publish release of assertor
+      env:
+        CARGO_REGISTRY_TOKEN: ${{secrets.CARGO_REGISTRY_TOKEN}}
+      run: cargo publish -p assertor