instant (dev) sandbox (#171)

* instant (dev) sandbox

* leave Dockerfile as is to pass deploy test

* fix comma

* fix prod build

* do not use "images exists" which docker does not support

* separate dev-mode flag

* Merge remote-tracking branch 'origin/main' into instant_sandbox

Dockerfile-dev

@@ -0,0 +1,31 @@
+FROM docker.io/library/node:20-slim
+
+# install minimal set of packages, then clean up
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  man-db \
+  curl \
+  dnsutils \
+  less \
+  jq \
+  bc \
+  gh \
+  git \
+  unzip \
+  rsync \
+  ripgrep \
+  procps \
+  psmisc \
+  lsof \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
+
+# set up npm global package folder under /usr/local/share
+# give it to non-root user node, already set up in base image
+RUN mkdir -p /usr/local/share/npm-global \
+  && chown -R node:node /usr/local/share/npm-global
+ENV NPM_CONFIG_PREFIX=/usr/local/share/npm-global
+ENV PATH=$PATH:/usr/local/share/npm-global/bin
+
+# switch to non-root user node
+USER node
+