Add support for Fedora 35

[rbhanda]

This issue is created to track progress for the work to enable Fedora 35 support for .NET Core 3.1 and .NET 5.0.

Product and Test updates

• [All teams] Do a compatibility check for the product with the new OS
• [CoreCLR/CoreFX] Runtime / RID Support update
• [Infra] Ensure that the correct Docker images used by teams are built in the dotnet-buildtools-prereqs (if applicable)
• [Infra] Replace docker tags used in builds across repos and branches
• [CLI team] Update CI legs to latest updated Dockerfile
• [All teams] Update test infrastructure to support the new version
• [Acquisition] Add support within nightly repos
• [Acquisition] Deploy to master (GA) during next patch release cycle

Release team:

• Notify .NET Core teams regarding new OS release
• Follow up with infra and add feed for new OS release to packages.microsoft.com
• Update release manifest files
• Create new Docker files to test the new OS
• Update the supported OS content on GitHub and marketing sites.

Document updates:

• Add OS prerequisites to the dependencies document
• Update distro install page

[mthalman]

We don't produce official .NET Docker images for Fedora so I've crossed out the related tasks for that.

[omajid]

RID support for Fedora 35 has been merged into all supported branches:

• main: Add Fedora 35 RID runtime#48200
• 5.0: [release/5.0] Add Fedora 35 RID runtime#48203
• 3.1: [release/3.1] Add Fedora 35 RID corefx#43032
• 2.1: [release/2.1] Add Fedora 35 RID corefx#43033

[wfurt]

On similar note, Fedora 32 is out of support if I read it correctly: https://fedoraproject.org/wiki/Releases
Should we stop building old containers @mthalman ?

[mthalman]

On similar note, Fedora 32 is out of support if I read it correctly: https://fedoraproject.org/wiki/Releases
Should we stop building old containers @mthalman?

Related to #6431. There needs to be an os-support issue for coordinating all the changes necessary for dealing with an out of support OS. cc @rbhanda

[adegeo]

@omajid At what time would the packages be ready to run and install? I can coordinate updating the install article with 35

[omajid]

@omajid At what time would the packages be ready to run and install? I can coordinate updating the install article with 35

Thanks, @adegeo ! The packages for Fedora 35 were ready back in May. But Fedora 35 itself doesn't get released until end of October. From our discussion, I think we want to hold off on updating docs until Fedora 35 is much closer to release?

Edit: Fedora hasn't shipped .NET Core 2.1 in the distro itself. But since .NET Core 2.1 will go EOL before 35, I don't think it matters that it's not available in Fedora 35?

[rbhanda]

Edit: Fedora hasn't shipped .NET Core 2.1 in the distro itself. But since .NET Core 2.1 will go EOL before 35, I don't think it matters that it's not available in Fedora 35?

I updated the original issue. Since .NET Core 2.1 will be EOL by August, Fedora 35 will not be a supporting OS on it,

[adegeo]

@omajid No worries. We can do it later in October 😄