Fix broken multiline run step in github job

Author: johnflavin-fw

.github/workflows/trivy-scanning.yml

@@ -14,8 +14,8 @@ jobs:
 
       - name: Build images for nginx, web and db
         run: |
-          docker build -t docker.io/xnat-docker-compose/xnat_docker_compose_xnat-nginx:${{ github.sha }} nginx/
-          docker build -t docker.io/xnat-docker-compose/xnat_docker_compose_xnat-web:${{ github.sha }} tomcat/
+          docker build -t docker.io/xnat-docker-compose/xnat_docker_compose_xnat-nginx:${{ github.sha }} nginx/ && \
+          docker build -t docker.io/xnat-docker-compose/xnat_docker_compose_xnat-web:${{ github.sha }} tomcat/ && \
           docker build -t docker.io/xnat-docker-compose/xnat_docker_compose_xnat-db:${{ github.sha }} postgres/
 
       - name: Run Trivy vulnerability scanner on nginx