Please create CI containers with gcc 12

[vlsunil]

Is your feature request related to a problem? Please describe.
RISC-V build needs to move to gcc12 by updating tools_def.template. This is an incompatible change and hence it would break CI tests with GCC < 12. So, request CI container image with GCC updated to 12 for testing. Once things are fine, we can update both CI image used and the patch together.

Describe the solution you'd like
CI container image with GCC 12

Describe alternatives you've considered
NA

Additional context
NA

[osteffenrh]

Closed by #60