chore: add set milestone action (#27)

Co-authored-by: ocmbot[bot] <125909804+ocmbot[bot]@users.noreply.github.com>

Author: ocmbot[bot]

.github/workflows/milestone.yaml

@@ -0,0 +1,16 @@
+name: Set milestone
+on:
+  issues:
+    types:
+    - closed
+  pull_request:
+    types:
+    - closed
+
+jobs:
+  set_milestone:
+    uses: open-component-model/.github/.github/workflows/milestone.yml@main
+    secrets: inherit
+    permissions:
+      issues: write
+      pull-requests: write