Convert to Github Actions

[Waterdrips]

Description

This PR converts from travis building to github actions building, testing and publishing the Gateway and BasicAuth containers.

Motivation and Context

• I have raised an issue to propose this change (required)
• My issue has received approval from the maintainers or lead with the design/approved label
  GitHub Actions Migration - tracking issue #1585

How Has This Been Tested?

builds and publishes on my own fork successful, ran a cluster with my ghcr images swapped in and it worked.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.

[alexellis]

Can I do anything to help with this? We will need it shortly to merge in #1601

[Waterdrips]

ok, tested the last bit now and the gateway funcstore now sets the correct arch (tested on pi3 and pi4.)

[alexellis]

How much time does it add to add a faas-cli build of the sample functions folder?

[Waterdrips]

How much time does it add to add a faas-cli build of the sample functions folder?

not log, ill add it today. Ill also change the lisence-check to latest while im there

[Waterdrips]

How much time does it add to add a faas-cli build of the sample functions folder?

long time, plus sentimentanalysis is broken (wont compile, think its a gcc/musilc issue in alpine)

[alexellis]

"long time" = 1m 5m 45m?