feat: [DPE-5768] - Add CI release workflow for Snap Store (#5)

This pull request adds a new GitHub Actions workflow for releasing to
the Snap Store. The most important changes include defining the workflow
name and configuration, specifying the trigger for the workflow, and
setting up the build and release jobs.

.github/workflows/release.yaml

@@ -0,0 +1,30 @@
+# Copyright 2024 Canonical Ltd.
+# See licenses/LICENSE-snap file for licensing details.
+name: Release to Snap Store
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - 3.5/edge
+
+jobs:
+  build:
+    name: Build snap
+    uses: canonical/data-platform-workflows/.github/workflows/[email protected]
+
+  release:
+    name: Release snap
+    needs:
+      - build
+    uses: canonical/data-platform-workflows/.github/workflows/[email protected]
+    with:
+      channel: 3.5/edge
+      artifact-prefix: ${{ needs.build.outputs.artifact-prefix }}
+    secrets:
+      snap-store-token: ${{ secrets.SNAP_STORE_TOKEN }}
+    permissions:
+      contents: write  # Needed to create GitHub release