feat(DPE-5768): - add release workflow (#8)

This pull request introduces a new GitHub Actions workflow to automate
the release process to the Snap Store. The most important changes
include adding licensing details, defining the workflow name and
concurrency settings, specifying the trigger conditions, and setting up
the build and release jobs.

New GitHub Actions workflow:

*
[`.github/workflows/release.yaml`](diffhunk://#diff-e426ed45842837026e10e66af23d9c7077e89eacbe6958ce7cb991130ad05adaR1-R30):
* Added licensing details, defined the workflow name as "Release to Snap
Store", and set concurrency settings to cancel in-progress runs for the
same workflow and branch.
* Specified the workflow trigger to run on pushes to the `3.5/edge`
branch.
* Added a build job using the
`canonical/data-platform-workflows/.github/workflows/[email protected]`
workflow.
* Added a release job that depends on the build job, using the
`canonical/data-platform-workflows/.github/workflows/[email protected]`
workflow, and configured it with the necessary channel, artifact prefix,
and secrets.

.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