Build from source by default (#4359)

* Optimize build from source

* Build from source by default

* Don't remove source

* Print layer history in CI

docker/from_source.Dockerfile

@@ -1,50 +0,0 @@
-#######################
-#
-# To build from source:
-#
-# Edit root docker-compose.yml
-# ```yaml
-# services:
-#   beacon_node:
-#     build:
-#       context: .
-#       dockerfile: docker/from_source.Dockerfile
-# ```
-#
-# If you need to see the commit and branch in logs + metrics,
-# comment this line from .dockerignore
-# ```
-# .git
-# ```
-#
-#######################
-
-FROM node:16-alpine as build
-WORKDIR /usr/app
-RUN apk update && apk add --no-cache g++ make python3 && rm -rf /var/cache/apk/*
-
-# Installs all deps in the root yarn.lock, which are most of them. To cache before copying the src
-COPY package.json yarn.lock ./
-RUN yarn install --non-interactive --frozen-lockfile --ignore-scripts
-
-COPY . .
-RUN yarn install --non-interactive --frozen-lockfile && yarn build
-
-# To have access to the specific branch and commit used to build this source,
-# a git-data.json file is created by persisting git data at build time. Then,
-# a version string like `v0.35.0-beta.0/HEAD/82219149 (git)` can be shown in
-# the terminal and in the logs; which is very useful to track tests better.
-RUN cd packages/cli && yarn write-git-data
-
-# Copy built src + node_modules to a new layer to prune unnecessary fs
-# Previous layer weights 7.25GB, while this final 488MB (as of Oct 2020)
-FROM node:16-alpine
-WORKDIR /usr/app
-COPY --from=build /usr/app .
-
-# NodeJS applications have a default memory limit of 2.5GB.
-# This limit is bit tight for a Prater node, it is recommended to raise the limit
-# since memory may spike during certain network conditions.
-ENV NODE_OPTIONS=--max-old-space-size=4096
-
-ENTRYPOINT ["node", "./packages/cli/bin/lodestar"]