Add devcontainer

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.154.0/containers/alpine/.devcontainer/base.Dockerfile
+
+# [Choice] Alpine version: 3.12, 3.11, 3.10
+ARG VARIANT="3.12"
+FROM mcr.microsoft.com/vscode/devcontainers/base:0-alpine-${VARIANT}
+
+# ** [Optional] Uncomment this section to install additional packages. **
+# RUN apk update \
+#     && apk add --no-cache <your-package-list-here>

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.154.0/containers/alpine
+{
+	"name": "Alpine",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick an Alpine version: 3.10, 3.11, 3.12
+		"args": { "VARIANT": "3.12" }
+	},
+
+	// Set *default* container specific settings.json values on container create. 
+	"settings": {
+		"terminal.integrated.shell.linux": "/bin/ash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	// Note that some extensions may not work in Alpine Linux. See https://aka.ms/vscode-remote/linux.
+	"extensions": [],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Uncomment when using a ptrace-based debugger like C++, Go, and Rust
+	// "runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}