fix: docker image scan action

Author: pvannierop

.github/workflows/scheduled-snyk-docker.yaml

@@ -14,10 +14,15 @@ jobs:
     permissions:
       contents: read
       security-events: write
+      packages: read
 
     steps:
       - uses: actions/checkout@v4
 
+      - name: Lowercase image name
+        run: |
+          echo "DOCKER_IMAGE=${DOCKER_IMAGE,,}" >>${GITHUB_ENV}
+
       - name: Run Snyk to check for vulnerabilities
         continue-on-error: true # To make sure that SARIF upload gets called
         uses: snyk/actions/docker@master