feat(config): make skipInstalls user-configurable

docs/usage/configuration-options.md

@@ -3768,6 +3768,12 @@ Configure this to `true` if you wish to get one PR for every separate major vers
 e.g. if you are on webpack@v1 currently then default behavior is a PR for upgrading to webpack@v3 and not for webpack@v2.
 If this setting is true then you would get one PR for webpack@v2 and one for webpack@v3.
 
+## skipInstalls
+
+By default, Renovate will use the most efficient approach to updating package files and lock files, which in most cases skips the need to perform a full module install by the bot.
+If this is set to false, then a full install of modules will be done.
+This is currently applicable to `npm` only, and only used in cases where bugs in `npm` result in incorrect lock files being updated.
+
 ## statusCheckNames
 
 You can customize the name/context of status checks that Renovate adds to commits/branches/PRs.

docs/usage/self-hosted-configuration.md

@@ -1008,12 +1008,6 @@ It could then be used in a repository config or preset like so:
 
 Secret names must start with an upper or lower case character and can have only characters, digits, or underscores.
 
-## skipInstalls
-
-By default, Renovate will use the most efficient approach to updating package files and lock files, which in most cases skips the need to perform a full module install by the bot.
-If this is set to false, then a full install of modules will be done.
-This is currently applicable to `npm` only, and only used in cases where bugs in `npm` result in incorrect lock files being updated.
-
 ## token
 
 ## unicodeEmoji

lib/config/options/index.ts

@@ -851,7 +851,6 @@ const options: RenovateOptions[] = [
       'Skip installing modules/dependencies if lock file updating is possible without a full install.',
     type: 'boolean',
     default: null,
-    globalOnly: true,
   },
   {
     name: 'autodiscover',