Add workflow for setting lastCheckedRecentChanges

.github/workflows/set-timestamp.yaml

@@ -0,0 +1,25 @@
+on:
+  workflow_dispatch:
+    inputs:
+      timestamp:
+        description: 'Timestamp to inject into wiki-meta-cache.yaml. Example: 2022-10-30T19:37:23.138Z'
+        required: true
+        type: string
+
+name: Set lastCheckedRecentChanges
+
+jobs:
+  recent:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+      - uses: actions/cache@v3
+        with:
+          path: data/wiki-meta-cache.yaml
+          key: wiki-meta-cache-${{ github.run_id }}
+          restore-keys: |
+            wiki-meta-cache
+      - run: |
+          echo "lastCheckedRecentChanges: '${{ inputs.timestamp }}'" > data/wiki-meta-cache.yaml