diff --git a/.github/workflows/scan.yml b/.github/workflows/scan.yml
new file mode 100644
index 0000000..a1b119b
--- /dev/null
+++ b/.github/workflows/scan.yml
@@ -0,0 +1,26 @@
+name: build
+
+on:
+  schedule:
+    # Scan the image regularly (once a day)
+    - cron: '13 02 * * *'
+
+jobs:
+  build:
+    name: Scan current image & report results
+    runs-on: "ubuntu-20.04"
+    steps:
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: 'ghcr.io/wonderfall/mastodon'
+          format: 'template'
+          template: '@/contrib/sarif.tpl'
+          output: 'trivy-results.sarif'
+          severity: 'CRITICAL,HIGH'
+          vuln-type: "os"
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v1
+        with:
+          sarif_file: 'trivy-results.sarif'