Add swift 5.7 (#3)

* Add swift 5.7

* Update README

* tabbing

Author: adam-fowler

README.md

@@ -9,7 +9,7 @@
 | *Contributors* | [0xTim](https://github.com/0xTim), [adam-fowler](https://github.com/adam-fowler), [cloudnull](https://github.com/cloudnull) |
 | *Categories* | Community, Languages |
 | *Definition type* | Dockerfile |
-| *Supported architecture(s)* | x86-64 |
+| *Supported architecture(s)* | x86-64, arm64 |
 | *Works in Codespaces* | Yes |
 | *Container host OS support* | Linux, macOS, Windows |
 | *Container OS* | Debian |
@@ -20,14 +20,14 @@
 While the definition itself works unmodified, you can select the version of Swift the container uses by updating the `VARIANT` arg in the included `devcontainer.json` (and rebuilding if you've already created the container).
 
 ```json
-"args": { "VARIANT": "4" }
+"args": { "VARIANT": "5.7" }
 ```
 
 Given how frequently web applications use Node.js for front end code, this container also includes an optional install of Node.js. You can enable installation and change the version of Node.js installed or disable its installation by updating the `args` property in `.devcontainer/devcontainer.json`.
 
 ```jsonc
 "args": {
-    "VARIANT": "4",
+    "VARIANT": "5.7",
     "NODE_VERSION": "14" // Set to "none" to skip Node.js installation
 }
 ```

src/swift/.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
-# [Choice] Swift version: 5.6-focal, 5.5, 5.4, 5.3, 5.2, 5.1, 4.2
+# [Choice] Swift version: 5.7, 5.6-focal, 5.5, 5.4, 5.3, 5.2, 5.1, 4.2
 ARG VARIANT=${templateOption:imageVariant}
 FROM swift:${VARIANT}
 

src/swift/devcontainer-template.json

@@ -2,7 +2,7 @@
 	"id": "swift",
 	"version": "1.0.0",
 	"name": "Swift",
-	"description": "Develop Swift based applications. Includes everything you need to get up and running.",
+	"description": "Develop Swift based applications. Includes appropriate runtime args and everything you need to get up and running.",
 	"documentationURL": "https://github.com/microsoft/vscode-dev-containers/tree/main/containers/swift",
 	"publisher": "Community",
 	"licenseURL": "https://github.com/microsoft/vscode-dev-containers/blob/main/LICENSE",
@@ -11,6 +11,7 @@
 			"type": "string",
 			"description": "Swift version:",
 			"proposals": [
+				"5.7",
 				"5.6-focal",
 				"5.5",
 				"5.4",
@@ -19,7 +20,7 @@
 				"5.1",
 				"4.2"
 			],
-			"default": "5.6-focal"
+			"default": "5.7"
 		},
 		"installZsh": {
 			"type": "boolean",