Add check to workflows

.github/workflows/check.yml

@@ -0,0 +1,15 @@
+name: "Check Image"
+on:
+  workflow_dispatch:
+
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Check
+        run: |
+          ./scripts/check-image.sh

scripts/check-image.sh

@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
+set -o errexit
+set -o nounset
+set -o pipefail
+
 declare -A DOMAIN_MAP=()
 
 for line in $(cat ./domain.txt); do