Add test for using previous stages as FROM source (#342)

Depends on apple/container-builder-shim#38 and a
new builder image tag
Related to #334

Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>

Author: katiewasnothere

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 scVersion = "0.4.1"
-let builderShimVersion = "0.3.0"
+let builderShimVersion = "0.4.0"
 
 let package = Package(
     name: "container",

Tests/CLITests/Subcommands/Build/CLIBuilderTest.swift

@@ -47,6 +47,23 @@ extension TestCLIBuildBase {
             #expect(try self.inspectImage(imageName) == imageName, "expected to have successfully built \(imageName)")
         }
 
+        @Test func testBuildFromPreviousStage() throws {
+            let tempDir: URL = try createTempDir()
+            let dockerfile =
+                """
+                FROM ghcr.io/linuxcontainers/alpine:3.20 AS layer1
+                RUN sh -c "echo 'layer1' > /layer1.txt"
+
+                FROM layer1
+                CMD ["cat", "/layer1.txt"]
+                """
+
+            try createContext(tempDir: tempDir, dockerfile: dockerfile)
+            let imageName = "registry.local/from-previous-layer:\(UUID().uuidString)"
+            try self.build(tag: imageName, tempDir: tempDir)
+            #expect(try self.inspectImage(imageName) == imageName, "expected to have successfully build \(imageName)")
+        }
+
         @Test func testBuildFromLocalImage() throws {
             let tempDir: URL = try createTempDir()
             let dockerfile: String =