* Add `setup-auth.sh` and `.env`, which is used by Docker Compose
* Set up or apply auth on etcd server through `etcd-setup-auth` (an ephemeral container)
* Improve configuration for connecting to `etcd` and `kvstore`
  - Add environment variables of `etcd`
  - Read envs and set to the configs (including auth info)
  - Retry several times until you connect to the `etcd` server
* Update examples for `etcd` test

* Add `.env` and set variables with interpolation in the compose file
* Specify environment variables for Docker-Compose
* Match the specified environment variables with the environment variables of each service
* Set default values ​​for each service environment variable

…onment variables

* Add `setup-auth.sh` and `.env`, which is used by Docker Compose
* Set up or apply auth on etcd server through `etcd-setup-auth` (an ephemeral container)
* Improve configuration for connecting to `etcd` and `kvstore`
  - Add environment variables of `etcd`
  - Read envs and set to the configs (including auth info)
  - Retry several times until you connect to the `etcd` server
* Update examples for `etcd` test

* Add `.env` and set variables with interpolation in the compose file
* Specify environment variables for Docker-Compose
* Match the specified environment variables with the environment variables of each service
* Set default values ​​for each service environment variable

* Add environment variables of etcd to `setup.env`, `Dockerfile`, `docker-compose.yaml`, and `docker-compose-custom.yaml`
* Specify `pull_policy: missing` for cb-tumblebug service in `docker-compose.yaml` and `docker-compose-custom.yaml`
* Read `etcd` environment variables and initialize `kvstore`
* Note - the endpoints environment variable of TB in `.env` specifies the target, because setting the environment variable can affect the relationship between compose services.