feat: add/expose cli flags (#771)

* feat: add/expose cli flags

Signed-off-by: Hans Song <hans.m.song@gmail.com>

* fix tests

Signed-off-by: Hans Song <hans.m.song@gmail.com>

* remove skipdeps from subcommand options

Signed-off-by: Hans Song <hans.m.song@gmail.com>

* remove skip-deps from subcommand flags

Signed-off-by: Hans Song <hans.m.song@gmail.com>

* remove SkipDeps from subcommand implementations

Signed-off-by: Hans Song <hans.m.song@gmail.com>

* update doco with new flags

Signed-off-by: Hans Song <hans.m.song@gmail.com>

---------

Signed-off-by: Hans Song <hans.m.song@gmail.com>

cmd/diff.go

@@ -40,7 +40,6 @@ func NewDiffCmd(globalCfg *config.GlobalImpl) *cobra.Command {
 	f.BoolVar(&diffOptions.IncludeTests, "include-tests", false, "enable the diffing of the helm test hooks")
 	f.BoolVar(&diffOptions.IncludeNeeds, "include-needs", false, `automatically include releases from the target release's "needs" when --selector/-l flag is provided. Does nothing when --selector/-l flag is not provided`)
 	f.BoolVar(&diffOptions.IncludeTransitiveNeeds, "include-transitive-needs", false, `like --include-needs, but also includes transitive needs (needs of needs). Does nothing when --selector/-l flag is not provided. Overrides exclusions of other selectors and conditions.`)
-	f.BoolVar(&diffOptions.SkipDeps, "skip-deps", false, `skip running "helm repo update" and "helm dependency build"`)
 	f.BoolVar(&diffOptions.SkipDiffOnInstall, "skip-diff-on-install", false, "Skips running helm-diff on releases being newly installed on this apply. Useful when the release manifests are too huge to be reviewed, or it's too time-consuming to diff at all")
 	f.BoolVar(&diffOptions.ShowSecrets, "show-secrets", false, "do not redact secret values in the output. should be used for debug purpose only")
 	f.BoolVar(&diffOptions.NoHooks, "no-hooks", false, "do not diff changes made by hooks.")