Add dotnet 6.0 image

This is to include a dotnet 6.0 image in addition to the 3.1 and 5.0 ones (although just thinking about it now it might have made more sense to just move the 5.0 image to 6.0 since 6.0 will be supported long term and 5.0 isn't).

I set up docker on WSL on my workstation to build this locally, all seemed to work; let me know if I missed anything.

This is in preparation for moving the skeleton to .NET 6.0, and then moving all of our .NET Core 3.1 projects to .NET 6.0.

requested review from @s-anelso56

assigned to @rfeese2

approved this merge request

Looks good to me

Do we want to go ahead and remove 5.0? I don't think anything is using it.

I think we might as well remove it, especially if nothing is using it. I'll update the makefile and remove the dockerfile for it.

added 1 commit

• 9e0315e9 - Remove .NET 5.0 image

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approved this merge request

I think this should be ok. I had to double-check the upstream container--I think we need to run the Debian-derived container in order to install the extra utilities (jre, and sonarscanner client). It looks like their default container is the Debian one.

merged

mentioned in commit 7a4e3298