Added dotnet80 stack

[msivasubramaniaan]

What does this PR do?:

Added dotnet80 stack

Which issue(s) this PR fixes:

devfile/api#1540

PR acceptance criteria:

• Contributing guide
  Have you read the devfile registry contributing guide and followed its instructions?
• Test automation
  Does this repository's tests pass with your changes?
• Documentation
  Does any documentation need to be updated with your changes?
• Check Tools Provider
  Have you tested the changes with existing tools, i.e. Odo, Che, Console? (See devfile registry contributing guide on how to test changes)

How to test changes / Special notes to the reviewer:

[openshift-ci]

Hi @msivasubramaniaan. Thanks for your PR.

I'm waiting for a devfile member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Jdubrick]

Who is going to be the stack owner of this new stack?

[msivasubramaniaan]

Who is going to be the stack owner of this new stack?

I am planning to own this stack and added the entry on https://github.com/devfile/registry/blob/main/.github/CODEOWNERS

[Jdubrick]

/ok-to-test

[thepetk]

LGTM in general, we need to fix the CODEOWNERS file before merging (both fixing the handle and giving sufficient access to the codeowner).

[thepetk]

Needs review from the @devfile/che-team too.

[svor]

Just one suggestion to use 2.2.2 schema version

[svor]

lgtm

[thepetk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jdubrick, msivasubramaniaan, svor, thepetk

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