meta: adjust merge operations

Adds a 'merge-release' workflow that runs on any push to a release
branch.  At present the only job merges the triggering branch to
'ops-tlon'.

Also renames the 'merge' workflow to 'merge-master' to distinguish it
appropriately.

.github/workflows/merge-release.yml

@@ -0,0 +1,17 @@
+name: ops-merge
+on:
+  push:
+    branches:
+      - 'release/*'
+jobs:
+  merge-release-to-ops:
+    runs-on: ubuntu-latest
+    name: "Merge to ops-tlon"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: devmasx/merge-branch@v1.3.1
+        with:
+          type: now
+          target_branch: ops-tlon
+          github_token: ${{ secrets.JANEWAY_BOT_TOKEN }}
+