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>

examples/config-ui.json

@@ -0,0 +1,23 @@
+{
+  "distSpecVersion": "1.1.0-dev",
+  "storage": {
+    "rootDirectory": "/tmp/zot"
+  },
+  "http": {
+    "address": "0.0.0.0",
+    "port": "8080"
+  },
+  "log": {
+    "level": "debug"
+  },
+  "extensions": {
+    "search": {
+      "cve": {
+        "updateInterval": "2h"
+      }
+    },
+    "ui": {
+      "enable": true
+    }
+  }
+}