[FIX] CI 환경변수 설정

Author: bkw535

.github/workflows/ci.yml

@@ -33,7 +33,8 @@ jobs:
         run: |
           docker run -d --name test-container \
             -e FIREBASE_SERVICE_ACCOUNT_BASE64="${{ secrets.FIREBASE_SERVICE_ACCOUNT_BASE64 }}" \
-            ${{ secrets.DOCKER_HUB_USERNAME }}/commit-api:latest
+            ${{ secrets.DOCKER_HUB_USERNAME }}/commit-api:latest \
+            /bin/sh -c "echo \$FIREBASE_SERVICE_ACCOUNT_BASE64 | base64 -d > /app/config/service-account-key.json && node src/index.js"
           sleep 5
           CONTAINER_STATUS=$(docker inspect -f '{{.State.Running}}' test-container)
           docker logs test-container