Introduce --verbose flag that enables logs.Warn logs (ko-build#600)

* Introduce --verbose flag that enables logs.Warn logs

* regenerate docs

Isolate unit tests from os.Environ (ko-build#455)

Platform resolution unit tests were affected by GOARCH/GOOS. Move the
os.Environ() call out of the function under test to avoid this.

Fix regression in adding /ko-app to PATH (ko-build#448)

Use Go 1.16+ to release (ko-build#444)

Bump github.com/spf13/viper from 1.8.1 to 1.9.0 (ko-build#442)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.8.1...v1.9.0)

---
updated-dependencies:
- dependency-name: github.com/spf13/viper
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs: typo on README.md (ko-build#359)

Merge pull request ko-build#338 from mgiessing/main

support goarch mips64le architecture. (ko-build#309)

Fix GOROOT mismatch issues (ko-build#303)

Print a warning if GOROOT is unset and ko's default build context
differs from $(go env GOROOT) and use the result of $(go env GOROOT).

Fix ko login (ko-build#299)

This was missed when main.go was moved to the root.