タグとバージョンの扱いを変更・改行コードLFの強制・その他調整

.devcontainer/devcontainer.json

@@ -3,10 +3,10 @@
 {
 	"name": "Alpine",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/base:alpine"
+	"image": "mcr.microsoft.com/devcontainers/base:alpine-3.20",
 
-	// Features to add to the dev container. More info: https://containers.dev/features.
-	// "features": {},
+	// Features to add to the dev container. More info: https://containers.dev/features.	
+	//"features": { }
 
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
@@ -19,4 +19,4 @@
 
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
 	// "remoteUser": "root"
-}
+}