이렇게 하려 했는데 github actions에서 시크릿에 json 넣는것을 피하라 했다
To help ensure that GitHub redacts your secret in logs,
avoid using structured data as the values of secrets.
For example, avoid creating secrets that contain JSON or encoded Git blobs.
그래서 해결하다가 중간에 바꿨다
- name: Setup Firebase service key
run: |
mkdir -p src/main/resources/firebase
echo $ | base64 -d > src/main/resources/firebase/firebase-service-key.json