Add Coherent CI/release workflow

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: jaraco

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: tests
+
+on:
+  merge_group:
+  push:
+    branches-ignore:
+    # temporary GH branches relating to merge queues (jaraco/skeleton#93)
+    - gh-readonly-queue/**
+    tags:
+    # required if branches-ignore is supplied (jaraco/skeleton#103)
+    - '**'
+  pull_request:
+
+jobs:
+  main:
+    uses: coherent-oss/system/.github/workflows/main.yml@main
+    permissions:
+      contents: write
+    secrets:
+      PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}