CorePack is my client-side modpack I have been playing with for years. This repo contains the buildscripts to package all needed resources into a MultiMC instance zip file
Installation is simple. Install MultiMC, and grab the latest CorePack zip. Inside MultiMC, add a new instance, and select the downloaded ZIP file.
Once Minecraft is launched, you will need to go in to the resource pack menu, and enable all the packs marked incompatible. By default, modpacks cannot load textures from older versions, even though they are compatible with eachother anyways.
CorePack requires bazel.
# Build CorePack
bazel build //modpack
# Inspect the output
file ./bazel-bin/modpack/corepack.zip