spf13/cobra inserts comments with dates in generated Markdown files.
This change makes the presubmit check ignore those comments when
verifying that ko's Markdown docs are up-to-date.
Also fixes some `shellcheck` warnings.
* Generate Markdown docs
This is largely copied from similar work in go-containerregistry
This required moving the Root command definition out of main() into a
place where it could be referenced from the gendoc tooling.
* fix boilerplate
* moar fix boilerplate
* update cmd/ko/main.go
* set -j to GOMAXPROCS at runtime
* rebase on cli-runtime change
* remove trailing whitespace
* Implement ko deps
* actually add deps.go
* specify auth, useragent, platform
* stop reading tar if the context is cancelled
* chmod to the file's perms
* remove support for --platform, modules don't care about build tags
* fix copyright boilerplate
* drop fs dependency
* udpate module integration test to newer Go versions
* use entrypoint to identify the binary
* fix gosec finding, some style comments
* revert modules integration test change
* Move ko binary to root of project.
* go.mod says required golang version is 1.14
* go install uses the folder name
* lint and copyright bump
* moving the test file changed the test hash.
* more refs of cmd/test
* add deprecation message
* Add manual integration tests for various go mod corner cases.
* Move integration test back and actually test the outputs.
I realize now this is run in a travis CI job :) So I'll make it actually work.
* Add _, gofmt
* Add tools build constraint.
* Stop redirecting stderr
* Use local mode to support CI.
