Use Docker image to build devcontainer (#13565)

.devcontainer/devcontainer.json

@@ -1,16 +1,17 @@
 {
-	"image": "mcr.microsoft.com/devcontainers/base:ubuntu",
-	"features": {
-		"ghcr.io/devcontainers/features/node:1": {
-			"version": "22"
-		}
+	"build": {
+		"dockerfile": "../Dockerfile",
+		"context": "..",
+		"target": "base"
 	},
+	"postCreateCommand": "npm ci --no-audit --no-fund",
 	"customizations": {
 		"vscode": {
 			"extensions": [
 				"EditorConfig.EditorConfig",
 				"esbenp.prettier-vscode",
-				"samverschueren.linter-xo"
+				"samverschueren.linter-xo",
+				"davidanson.vscode-markdownlint"
 			]
 		}
 	}

Dockerfile

@@ -1,12 +1,10 @@
-FROM node:22-alpine
-
+FROM node:22-alpine AS base
 RUN apk add --no-cache git
-
 WORKDIR /simple-icons
-COPY package.json /simple-icons/
-COPY package-lock.json /simple-icons/
+
+FROM base AS final
+WORKDIR /simple-icons
+COPY . .
 RUN npm ci --no-audit --no-fund
 
-COPY . .
-
 ENTRYPOINT ["npx", "svgo", "/image.svg"]