chore: Add release job on push to main

Automatically publish the charm to the latest/edge branch when
a patch is pushed to the main branch.

Signed-off-by: Billy Olsen <[email protected]>

.github/workflows/release.yaml

@@ -0,0 +1,42 @@
+# Copyright 2024 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Release to latest/edge
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  ci-tests:
+    uses: ./.github/workflows/ci.yaml
+
+  release-to-charmhub:
+    name: Release to CharmHub
+    needs:
+      - ci-tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Select charmhub channel
+        uses: canonical/charming-actions/[email protected]
+        id: channel
+      - name: Upload charm to charmhub
+        uses: canonical/charming-actions/[email protected]
+        with:
+          credentials: "${{ secrets.CHARMCRAFT_AUTH }}"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          channel: "${{ steps.channel.outputs.name }}"