feature: add nightly shuffle test

Signed-off-by: Terry Howe <terrylhowe@gmail.com>

.github/workflows/shuffle.yaml

@@ -0,0 +1,25 @@
+name: "Shuffle test"
+on:
+  schedule:
+  - cron: "45 1 * * *"
+    branches:
+      - "main"
+
+permissions:
+  contents: read
+
+jobs:
+  shuffle:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # pin@v5.0.0
+      - name: Add variables to environment file
+        run: cat ".github/env" >> "$GITHUB_ENV"
+      - name: Setup Go
+        uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # pin@5.5.0
+        with:
+          go-version: '${{ env.GOLANG_VERSION }}'
+          check-latest: true
+      - name: Test shuffle
+        run: make test-unit TESTFLAGS="-shuffle=on -count=2"