Change Docker image tag to lowercase 'udtoolapi'

Author: 0xnullsect0r

.github/workflows/docker-image.yml

@@ -15,4 +15,4 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag UDToolAPI:$(date +%s)
+      run: docker build . --file Dockerfile --tag udtoolapi:$(date +%s)