Run linux container with same architechture as host

As the development team uses both Intel and Apple Silicon Macs,
we have to get the host CPU architecture at compilation time instead of
harcoding it.
If the container has a different architecture, the guest has to be
emulated.

Sources/TaskCLI/Docker.swift

@@ -0,0 +1,9 @@
+struct Docker {
+	static func getLinuxPlatformStringWithHostArchitecture() -> String {
+		#if arch(x86_64)
+		return "linux/amd64"
+		#else
+		return "linux/arm64"
+		#endif
+	}
+}

Sources/TaskCLI/GenerateDocumentation Command.swift

@@ -46,7 +46,7 @@ struct GenerateDocumentationCommand: Script {
 			try await docker(
 				"run", "--rm",
 				"-v", "\(tempDirectory.path):/code",
-				"--platform", "linux/arm64",
+				"--platform", Docker.getLinuxPlatformStringWithHostArchitecture(),
 				"-w", "/code",
 				"swift:latest",
 				"/bin/bash", "-c", script,

Sources/TaskCLI/Test Command.swift

@@ -26,7 +26,7 @@ struct TestCommand: Script {
 				"run",
 				"-v", "\(currentDirectory):/code",
 				"--security-opt", "systempaths=unconfined",
-				"--platform", "linux/arm64",
+				"--platform", Docker.getLinuxPlatformStringWithHostArchitecture(),
 				"-w", "/code", "swift:latest",
 				"/bin/bash", "-c", "swift test --skip InotifyLimitTests; swift test --skip-build --filter InotifyLimitTests"
 			)