Fix datadog image

[jt-dd]

Fix datadog image. Currently running an error if kubehound start with Datadog image.

DD_API_KEY="as" DD_APP_KEY="asd" kubehound
INFO[03:28:20] Loading application configuration from default embedded
INFO[03:28:20] Using /Users/julien.terriac/.config/kubehound.yaml for default config
INFO[03:28:20] Initializing application telemetry
WARN[03:28:20] Telemetry disabled via configuration
INFO[03:28:20] Loading backend from default embedded
INFO[03:28:20] Spawning the kubehound stack
[+] Running 2/2
 ✔ datadog Pulled                                                                                                                                                                                                                                                             74.8s
   ✔ 93ad6f59c0e8 Pull complete                                                                                                                                                                                                                                               73.3s
[+] Running 0/3
 ⠸ Container kubehound-release-kubegraph-1   Recreate                                                                                                                                                                                                                          1.4s
 ⠸ Container kubehound-release-ui-jupyter-1  Recreate                                                                                                                                                                                                                          1.4s
 ⠸ Container kubehound-release-datadog-1     Creating                                                                                                                                                                                                                          1.4s
FATA[03:29:37] error starting the kubehound stack: Error response from daemon: create datadog/datadog.yaml: "datadog/datadog.yaml" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed. If you intended to pass a host directory, use absolute path. Please make sure your Docker is correctly installed and that you have enough disk space available.