🔨🔥 alpine based devcontainer with working yarn PnP

ref #108

.devcontainer/Dockerfile

@@ -1,2 +1,6 @@
-ARG VARIANT="14-buster"
-FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-${VARIANT}
+FROM mcr.microsoft.com/vscode/devcontainers/base:alpine-3.12
+RUN apk update
+RUN apk add --upgrade nodejs-current npm
+RUN npm i -g yarn rimraf
+RUN rimraf node_modules
+RUN yarn set version berry