Add admin workflow for automatic issue labelling (close #346)

For PR #347

* Add admin workflow for automatic issue labelling (close #346)

* Add job to link issues with PRs

Author: mscwilson

.github/workflows/admin.yml

@@ -0,0 +1,36 @@
+name: Admin
+
+on:
+  create:
+  pull_request:
+    types:
+      - opened
+    branches:
+      - 'release/**'
+  push:
+    branches:
+      - "release/**"
+
+jobs:
+  update-labels:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Update issue status labels
+        uses: snowplow-incubator/labels-helper-action@v1
+        env:
+          ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  link-pr-issue:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Match the issue to the PR
+        uses: snowplow-incubator/pull-request-helper-action@v1
+        env:
+          ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}