test: improve reliability of E2E local npm registry on CI

This change limits the number of sockets used by the local npm registry during E2E tests as well as keeping a limited pool alive for reuse.

(cherry picked from commit 6a5286b)

Author: clydin

package.json

@@ -221,7 +221,8 @@
     "tslint-no-circular-imports": "^0.7.0",
     "tslint-sonarts": "1.9.0",
     "typescript": "3.9.5",
-    "verdaccio": "4.5.1",
+    "verdaccio": "4.8.1",
+    "verdaccio-auth-memory": "^9.7.2",
     "webpack": "4.42.1",
     "webpack-dev-middleware": "3.7.2",
     "webpack-dev-server": "3.10.3",

tests/legacy-cli/verdaccio.yaml

@@ -1,13 +1,20 @@
 storage: ./storage
 
 auth:
-  htpasswd:
-    file: ./htpasswd
-    max_users: -1
+  auth-memory:
+    users: {}
 
 uplinks:
   npmjs:
     url: https://registry.npmjs.org/
+    cache: false
+    maxage: 20m
+    max_fails: 32
+    timeout: 60s
+    agent_options:
+      keepAlive: true
+      maxSockets: 32
+      maxFreeSockets: 8
 
 packages:
   '@angular/{cli,pwa}':
@@ -26,6 +33,10 @@ packages:
     access: $all
     publish: $all
 
+  '@*/*':
+    access: $all
+    proxy: npmjs
+
   '**':
     access: $all
     proxy: npmjs