Implement ko deps (#403)

* 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

pkg/commands/commands.go

@@ -31,6 +31,7 @@ func AddKubeCommands(topLevel *cobra.Command) {
 	addResolve(topLevel)
 	addPublish(topLevel)
 	addRun(topLevel)
+	addDeps(topLevel)
 	addCompletion(topLevel)
 }