added trailing slash

Author: Dan Kelley

.github/workflows/release-containers.yml

@@ -33,7 +33,7 @@ jobs:
     - name: 'Build Docker container image: server'
       run: |
         docker build \
-            --file src/server/Dockerfile
+            --file "src/server/Dockerfile" \ 
             --cache-from "${DOCKER_REPOSITORY}/server:latest" \
             --tag "${DOCKER_REPOSITORY}/server:latest" \
             --tag "${DOCKER_REPOSITORY}/server:${DOCKER_TAG}" \