GitHub actions for running tests

[applejag]

Issue #72 regards adding vulnerability scans, but this only regards unit testing and formatting checks

For all Go repos:

• Add unit testing action
• Add goimports diffing, making sure everything is formatted (via git diff --exit-code)

For Angular repo:

• Add unit testing action

This needs to be added as GitHub Actions to the applicable repos to be run on new or updated pull requests.

Codacy already deals with linting and some static code checks

Sub-issues

• Need automated testing via go test wharf-api#105
• Need automated testing via go test wharf-provider-azuredevops#43
• Need automated testing via go test wharf-provider-github#39
• Need automated testing via go test wharf-provider-gitlab#34
• Need automated testing via go test wharf-core#30
• Need automated testing via go test wharf-cmd#5
• Need automated testing via go test wharf-api-client-go#27
• Need automated testing via headless Chromium wharf-web#84

PRs

• Added go test & goimports actions wharf-api#106
• Added go test & goimports actions wharf-provider-azuredevops#45
• Added go test & goimports actions wharf-provider-github#41
• Added go test & goimports actions wharf-provider-gitlab#36
• Added go test & goimports actions wharf-core#31
• Added go test & goimports actions wharf-cmd#6
• Added go test & goimports actions wharf-api-client-go#28
• None yet for wharf-web

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The future plan is to have Wharf run and validate pull requests, but as Wharf lacks that functionality we have to settle with GitHub Actions, as some is better than none