Made platforms optional

Author: ankane

.github/workflows/build.yml

@@ -15,4 +15,4 @@ jobs:
           cd pgvector
           make
           sudo make install
-      - run: swift test
+      - run: TEST=1 swift test

Package.swift

@@ -1,12 +1,10 @@
 // swift-tools-version: 5.7
 
+import Foundation
 import PackageDescription
 
-let package = Package(
+var package = Package(
     name: "Pgvector",
-    platforms: [
-        .macOS(.v13),
-    ],
     products: [
         .library(
             name: "Pgvector",
@@ -49,3 +47,7 @@ let package = Package(
             ]),
     ]
 )
+
+if ProcessInfo.processInfo.environment["TEST"] != nil {
+    package.platforms = [.macOS(.v13)]
+}

README.md

@@ -132,7 +132,7 @@ To get started with development:
 git clone https://github.com/pgvector/pgvector-swift.git
 cd pgvector-swift
 createdb pgvector_swift_test
-swift test
+TEST=1 swift test
 ```
 
 To run an example: