Suggest to use a fixed version of docker image to avoid upgrade problem.

[Readon]

We have upgrade verilator to version 5.036 for the compatibility of the latest version, which is tagged as v1.3.0, and set to latest one by default.

This will lead to CI wrong, because some repos are using the image tagged as latest, only because it use verilator 5.036.

So, just check as below.
If you use SpinalHDL version <= 1.12.2, then verilator 4.228 is suported, use Spinal Docker in v1.2.0
If you use SpinalHDL version > 1.12.2, then verilator 5.036 is also suported, use Spinal Docker in v1.3.0