fix dockerfile linter warnings

[TianlongLiang]

Should we also consider adding a CI that uses hadolint to check Dockerfile?

[yamt]

is "replace curl with wget" change a recommendation from hadolint?
do you still need to install curl after the change?
i feel a little sad because i personally prefer curl over wget. :-)

[TianlongLiang]

Yes, it's a warning in the hadolint.
Since it's a devdocker, I think maybe should keep it installed in case anyone wants to use curl inside the container.

[yamt]

Yes, it's a warning in the hadolint. Since it's a devdocker, I think maybe should keep it installed in case anyone wants to use curl inside the container.

ok. thank you for explanation.

[wenyongh]

Hi @tonibofarull, this PR changes some docker file of wasi-nn, could you help check whether it is good to you? Thanks.

[wenyongh]

LGTM