update package deps for custom project root (#1412)

* package deps

* checkout collections 1.1.0

* package deps comment

Author: vanvoorden

Package.swift

@@ -40,20 +40,31 @@ let featureSettings: [SwiftSetting] = [
     .enableUpcomingFeature("MemberImportVisibility")
 ]
 
-var dependencies: [Package.Dependency] {
-    if Context.environment["SWIFTCI_USE_LOCAL_DEPS"] != nil {
+var dependencies: [Package.Dependency] = []
+
+if let useLocalDepsEnv = Context.environment["SWIFTCI_USE_LOCAL_DEPS"], !useLocalDepsEnv.isEmpty {
+    let root: String
+    if useLocalDepsEnv == "1" {
+        root = ".."
+    } else {
+        root = useLocalDepsEnv
+    }
+    dependencies += 
         [
             .package(
                 name: "swift-collections",
-                path: "../swift-collections"),
+                path: "\(root)/swift-collections"),
             .package(
                 name: "swift-foundation-icu",
-                path: "../swift-foundation-icu"),
+                path: "\(root)/swift-foundation-icu"),
             .package(
                 name: "swift-syntax",
-                path: "../swift-syntax")
+                path: "\(root)/swift-syntax")
         ]
-    } else {
+} else {
+    // These dependencies should match `update-checkout`
+    // See `update-checkout-config.json` for the `main` branch-scheme
+    dependencies += 
         [
             .package(
                 url: "https://github.com/apple/swift-collections",
@@ -65,7 +76,6 @@ var dependencies: [Package.Dependency] {
                 url: "https://github.com/swiftlang/swift-syntax",
                 branch: "main")
         ]
-    }
 }
 
 let wasiLibcCSettings: [CSetting] = [