refactor: logic in docker environment

[lvillis]

The judgment of docker containers can be more elegant, and the judgment of podman and k8s runtime can be added in the future.

[Eugeny]

Thank you for the contribution but /.dockerenv doesn't actually exist in the image

[lvillis]

Thank you for the contribution but /.dockerenv doesn't actually exist in the image

I tested it and found that .dockerenv exists in the root directory during runtime and setup. This method is reliable.

[Eugeny]

Not sure if it's your Docker configuration or something else, but the images built by CI from the main branch don't have that file:

❯ docker run --platform linux/amd64 --rm --entrypoint ls ghcr.io/warp-tech/warpgate:main  -la /
total 76
drwxr-xr-x   1 root root 4096 Nov  3 21:18 .
drwxr-xr-x   1 root root 4096 Nov  3 21:18 ..
drwxr-xr-x   2 root root 4096 Oct 24  2022 bin
drwxr-xr-x   2 root root 4096 Sep  3  2022 boot
drwxr-xr-x   2 root root 4096 Nov  3 21:18 data
drwxr-xr-x   5 root root  340 Nov  3 21:18 dev
drwxr-xr-x   1 root root 4096 Nov  3 21:18 etc
drwxr-xr-x   2 root root 4096 Sep  3  2022 home
drwxr-xr-x   8 root root 4096 Oct 24  2022 lib
drwxr-xr-x   2 root root 4096 Oct 24  2022 lib64
drwxr-xr-x   2 root root 4096 Oct 24  2022 media
drwxr-xr-x   2 root root 4096 Oct 24  2022 mnt
drwxr-xr-x   2 root root 4096 Oct 24  2022 opt
dr-xr-xr-x 321 root root    0 Nov  3 21:18 proc
drwx------   2 root root 4096 Oct 24  2022 root
drwxr-xr-x   3 root root 4096 Oct 24  2022 run
drwxr-xr-x   2 root root 4096 Oct 24  2022 sbin
drwxr-xr-x   2 root root 4096 Oct 24  2022 srv
dr-xr-xr-x  13 root root    0 Nov  3 21:18 sys
drwxrwxrwt   2 root root 4096 Oct 24  2022 tmp
drwxr-xr-x   1 root root 4096 Oct 24  2022 usr
drwxr-xr-x   1 root root 4096 Oct 24  2022 var