Fix relative path resolution in entrypoint (#987)

- Fixes #962.
- Adds test to exercise apple/containerization#473.
- Updates containerization to 0.20.1.

Signed-off-by: ParkSeongGeun <phd0801@naver.com>

Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "538f97f4c9123825536afb15abcaa4d9d865563e402bcb7fd26be69f55461c1d",
+  "originHash" : "b11a80bed0b568e35f4b538956344d483125e344c4931c362a2a31a2f7a8565b",
   "pins" : [
     {
       "identity" : "async-http-client",
@@ -16,7 +16,7 @@
       "location" : "https://github.com/apple/containerization.git",
       "state" : {
         "revision" : "452f354bac52ecbfe4a40b729880435a070c5a29",
-        "version" : "0.20.0"
+        "version" : "0.20.1"
       }
     },
     {

Package.swift

@@ -23,7 +23,7 @@ import PackageDescription
 let releaseVersion = ProcessInfo.processInfo.environment["RELEASE_VERSION"] ?? "0.0.0"
 let gitCommit = ProcessInfo.processInfo.environment["GIT_COMMIT"] ?? "unspecified"
 let builderShimVersion = "0.7.0"
-let scVersion = "0.20.0"
+let scVersion = "0.20.1"
 
 let package = Package(
     name: "container",

Tests/ContainerAPIClientTests/ParserTest.swift

@@ -845,4 +845,22 @@ struct ParserTest {
             return error.description.contains("invalid property format")
         }
     }
+
+    // MARK: - Relative Path Passthrough Tests
+
+    @Test
+    func testProcessEntrypointRelativePathPassthrough() throws {
+        let processFlags = try Flags.Process.parse(["--cwd", "/bin"])
+        let managementFlags = try Flags.Management.parse(["--entrypoint", "./uname"])
+
+        let result = try Parser.process(
+            arguments: [],
+            processFlags: processFlags,
+            managementFlags: managementFlags,
+            config: nil
+        )
+
+        #expect(result.executable == "./uname")
+        #expect(result.workingDirectory == "/bin")
+    }
 }