Keep the trailing equals sign out of parsed key names

String.split omits empty subsequences by default, so an argument ending in
"=" produced a single component. parseKeyValuePairs treated that as a
standalone key and stored the whole unsplit argument, leaving the equals
sign in the key name: "owner=" became the key "owner=" rather than "owner"
with an empty value.

The function's documentation states that a standalone key is treated as
"key=", so both spellings should produce the same key. Keeping empty
subsequences makes them agree.

This affects --label and --opt on `container volume create` and
`container network create`.

Fixes #2013

Author: devops-thiago

Sources/Services/ContainerAPIService/Client/Utility.swift

@@ -356,7 +356,7 @@ public struct Utility {
     public static func parseKeyValuePairs(_ pairs: [String]) -> [String: String] {
         var result: [String: String] = Dictionary(minimumCapacity: pairs.count)
         for pair in pairs {
-            let components = pair.split(separator: "=", maxSplits: 1)
+            let components = pair.split(separator: "=", maxSplits: 1, omittingEmptySubsequences: false)
             if components.count == 2 {
                 result[String(components[0])] = String(components[1])
             } else {

Tests/ContainerAPIClientTests/UtilityTests.swift

@@ -38,6 +38,14 @@ struct UtilityTests {
         #expect(result["standalone"] == "")
     }
 
+    @Test("Parse key with an explicitly empty value")
+    func testKeyWithEmptyValue() {
+        let result = Utility.parseKeyValuePairs(["owner="])
+
+        #expect(result["owner"] == "")
+        #expect(result["owner="] == nil)
+    }
+
     @Test("Parse empty input")
     func testEmptyInput() {
         let result = Utility.parseKeyValuePairs([])