add env to docker build

Author: burtenshaw

.github/workflows/docker-build.yml

@@ -79,6 +79,8 @@ jobs:
             dockerfile: src/envs/atari_env/server/Dockerfile
           - name: git-env
             dockerfile: src/envs/git_env/server/Dockerfile
+          - name: textarena-env
+            dockerfile: src/envs/textarena_env/server/Dockerfile
 
     steps:
       - name: Checkout code