feat: introduce a complete set of CI actions

.github/workflows/promote.yaml

@@ -0,0 +1,27 @@
+name: Promote Charm
+
+on:
+  workflow_dispatch:
+    inputs:
+      charm:
+        type: choice
+        description: Charm to promote
+        options:
+          - maas-region
+          - maas-agent
+      promotion:
+        type: choice
+        description: Channel to promote from
+        options:
+          - edge -> beta
+          - beta -> candidate
+          - candidate -> stable
+
+jobs:
+  promote:
+    name: Promote
+    uses: canonical/observability/.github/workflows/charm-promote.yaml@main
+    with:
+      charm-path: ${{ github.event.inputs.charm }}
+      promotion: ${{ github.event.inputs.promotion }}
+    secrets: inherit

.github/workflows/release.yaml

@@ -0,0 +1,21 @@
+name: Release Charms to Edge and Publish Libraries
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release-region:
+    uses: canonical/observability/.github/workflows/charm-release.yaml@main
+    secrets: inherit
+    with:
+      charm-path: maas-region
+      provider: lxd
+
+  release-agent:
+    uses: canonical/observability/.github/workflows/charm-release.yaml@main
+    secrets: inherit
+    with:
+      charm-path: maas-agent
+      provider: lxd

.github/workflows/update-libs.yaml

@@ -0,0 +1,22 @@
+name: Auto-update Charm Libraries
+on:
+  # Manual trigger
+  workflow_dispatch:
+  # Check regularly the upstream every four hours
+  schedule:
+    - cron: "0 0,4,8,12,16,20 * * *"
+
+jobs:
+  update-lib-region:
+    name: Check libraries
+    uses: canonical/observability/.github/workflows/charm-update-libs.yaml@main
+    secrets: inherit
+    with:
+      charm-path: maas-region
+
+  update-lib-agent:
+    name: Check libraries
+    uses: canonical/observability/.github/workflows/charm-update-libs.yaml@main
+    secrets: inherit
+    with:
+      charm-path: maas-agent