feat(ui): package zui within zot binary (#1161)

(cherry picked from commit d557da0baba819b7cd7e6b5941528776e125ac6d)

build(ui): fix stacker builds


(cherry picked from commit ba25daf02b4a9bc7ee1cb6f84b7a6b096ca7d61f)

build(ui): various fixes

- Fix metrics endpoint
- Fix unit tests unit tests
- Make the ui build optional in the makefile
before the linter lint runs in the golangci-lint workflow
- Do not attempt to include UI routes if search is enabled
- Fix authorization for search endpoint



fix: use zot tag in ui make target


(cherry picked from commit 2a6882fa23f06b2d68c6c299773a6ff50bf90e78)

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>
Signed-off-by: Catalin Hofnar <catalin.hofnar@gmail.com>
Signed-off-by: Andrei Aaron <aaaron@luxoft.com>
Co-authored-by: Ramkumar Chinchani <rchincha@cisco.com>

pkg/extensions/config/config.go

@@ -17,6 +17,7 @@ type ExtensionConfig struct {
 	Metrics *MetricsConfig
 	Scrub   *ScrubConfig
 	Lint    *LintConfig
+	UI      *UIConfig
 }
 
 type LintConfig struct {
@@ -52,3 +53,7 @@ type ScrubConfig struct {
 	BaseConfig `mapstructure:",squash"`
 	Interval   time.Duration
 }
+
+type UIConfig struct {
+	BaseConfig `mapstructure:",squash"`
+}