docs: add some precisions on known_hosts

README.md

@@ -315,18 +315,18 @@ Here are some advices about your **secrets** (variables marked with a :lock:):
 
 The Docker Compose template uses some global configuration used throughout all jobs and environments.
 
-| Input / Variable         | Description                            | Default value     |
-| ------------------------ | -------------------------------------- | ----------------- |
-| `image` / `DCMP_IMAGE` | The Docker image used to run Docker Compose CLI commands | `registry.hub.docker.com/library/docker:latest` |
-| `cmd` / `DCMP_CMD`     | The docker compose or stack command (`docker compose`, `docker-compose` or `docker stack`) | _none_ (auto) |
-| `base-app-name` / `DCMP_BASE_APP_NAME`| Base application name                  | `$CI_PROJECT_NAME` ([see GitLab doc](https://docs.gitlab.com/ee/ci/variables/predefined_variables.html)) |
+| Input / Variable         | Description                                                                                                                                                                         | Default value     |
+| ------------------------ |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| ----------------- |
+| `image` / `DCMP_IMAGE` | The Docker image used to run Docker Compose CLI commands                                                                                                                            | `registry.hub.docker.com/library/docker:latest` |
+| `cmd` / `DCMP_CMD`     | The docker compose or stack command (`docker compose`, `docker-compose` or `docker stack`)                                                                                          | _none_ (auto) |
+| `base-app-name` / `DCMP_BASE_APP_NAME`| Base application name                                                                                                                                                               | `$CI_PROJECT_NAME` ([see GitLab doc](https://docs.gitlab.com/ee/ci/variables/predefined_variables.html)) |
 | `environment-url` / `DCMP_ENVIRONMENT_URL`| Default environments url _(only define for static environment URLs declaration)_<br/>_supports late variable expansion (ex: `https://%{environment_name}.docker-compose.acme.com`)_ | _none_ |
-| `scripts-dir` / `DCMP_SCRIPTS_DIR`| Directory where Compose files, dotenv files and hook scripts are located | `.` _(root project dir)_ |
-| `up-opts` / `DCMP_UP_OPTS` | [`compose up` options](https://docs.docker.com/reference/cli/docker/compose/up/#options) (only when using Docker Compose) | `--no-build --remove-orphans --wait --wait-timeout 180` |
-| `down-opts`/ `DCMP_DOWN_OPTS` | [`compose down` options](https://docs.docker.com/reference/cli/docker/compose/down/#options) (only when using Docker Compose) | `--volumes --remove-orphans --rmi all` |
-| `stack-deploy-opts` / `DCMP_STACK_DEPLOY_OPTS` | [`stack deploy` options](https://docs.docker.com/reference/cli/docker/stack/deploy/) (only when using Docker Stack) | `--prune` |
-| :lock: `DCMP_SSH_PRIVATE_KEY` | Default SSH key to use when connecting to Docker hosts over SSH (can be overridden per env) | _none_ |
-| `ssh-known-hosts` / `DCMP_SSH_KNOWN_HOSTS` | SSH `known_hosts` (file or text variable) | _none_ |
+| `scripts-dir` / `DCMP_SCRIPTS_DIR`| Directory where Compose files, dotenv files and hook scripts are located                                                                                                            | `.` _(root project dir)_ |
+| `up-opts` / `DCMP_UP_OPTS` | [`compose up` options](https://docs.docker.com/reference/cli/docker/compose/up/#options) (only when using Docker Compose)                                                           | `--no-build --remove-orphans --wait --wait-timeout 180` |
+| `down-opts`/ `DCMP_DOWN_OPTS` | [`compose down` options](https://docs.docker.com/reference/cli/docker/compose/down/#options) (only when using Docker Compose)                                                       | `--volumes --remove-orphans --rmi all` |
+| `stack-deploy-opts` / `DCMP_STACK_DEPLOY_OPTS` | [`stack deploy` options](https://docs.docker.com/reference/cli/docker/stack/deploy/) (only when using Docker Stack)                                                                 | `--prune` |
+| :lock: `DCMP_SSH_PRIVATE_KEY` | Default SSH key to use when connecting to Docker hosts over SSH (can be overridden per env)                                                                                         | _none_ |
+| `ssh-known-hosts` / `DCMP_SSH_KNOWN_HOSTS` | SSH `known_hosts` (file or text variable: you can get its value with `ssh-keyscan -H <DOCKER_HOST>`, mandatory if you're using a remote docker through ssh)                         | _none_ |
 
 ### Review environments configuration