Add epic secrets

Author: kallenberg

.github/workflows/docker.yml

@@ -79,6 +79,9 @@ jobs:
           target: monolith
           tags: rwthika/carla-simulator:monolith${{ env.IMAGE_TAG_SUFFIX }}
           no-cache: true
+          secrets: |
+            "epic_user=${{ secrets.EPIC_USER }}"
+            "epic_token=${{ secrets.EPIC_TOKEN }}"
           build-args: |
             UBUNTU_DISTRO=${{ env.UBUNTU_DISTRO }}