Create Debian 12 validator install.md

Installation of a validator instance, from a clean Debian 12.5.

docs/validator/Debain 12 validator install.md

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+# Getting Started - Debain 12 fresh install
+This guide attempts to outline the steps required to setup a validator from a clean Debian 12 installation DVD or Netinstall. This guide is accurate as of Debain 12.5.0. 
+
+## Dependencies
+Before you get started, you need a few basic tools.
+
+Install Sudo
+```
+sudo apt-get install sudo
+```
+_update /etc/sudoers_
+
+#### Install newuidmap / newgidmap and iptables to the fresh install
+```
+sudo apt-get install -y uidmap
+sudo apt-get install -y iptables
+```
+
+#### Install Fuse overlaysfs
+```
+sudo apt-get install -y fuse-overlayfs
+```
+
+#### Install Fuse slirp4netns
+Rootless docker requires version of slirp4netns greater than v0.4.0 (when vpnkit is not installed).
+```
+sudo apt-get install -y slirp4netns
+```
+
+### Install docker ROOTLESS 
+https://docs.docker.com/engine/security/rootless/
+This only works if you do not have docker installed. This guide assumes a fresh install of Debain 12.5. 
+
+Run the rootless docker install script as the user you would like to run rootless with. I choose pid 1000 in this example. 
+
+```
+curl -fsSL https://get.docker.com/rootless | sh
+```
+[INFO] Make sure the following environment variables are set (or add them to ~/.bashrc and update TESTUSER to current username)
+```
+export PATH=/home/TESTUSER/bin:$PATH
+export DOCKER_HOST=unix:///run/user/1000/docker.sock
+```
+The binaries will be installed at ~/bin.
+
+#### Run a quick docker hello-world test
+```
+docker run hello-world
+```
+if you see you are good to go!:
+
+```
+Hello from Docker!
+This message shows that your installation appears to be working correctly.....
+```
+
+## Install development tools
+These tools are required to setup, download, compile and install Serai
+
+#### install basic tools for admin
+
+```
+sudo apt-get install curl -y
+```
+
+### Install rustup
+
+```
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+_Exit the current terminal to update enviroment variables and log back in._
+
+### Install Rust
+
+```
+rustup update
+rustup toolchain install stable
+rustup target add wasm32-unknown-unknown
+rustup toolchain install nightly
+rustup target add wasm32-unknown-unknown --toolchain nightly
+```
+### Install local dev tooling packages
+```
+sudo apt install build-essential -y
+sudo apt install protobuf-compiler -y
+sudo apt install git -y
+sudo apt install clang -y
+```
+
+
+### Install Solidity Compiler Version Manager
+
+```
+cargo install svm-rs
+svm install 0.8.16
+svm use 0.8.16
+```
+
+### Install foundry (for tests)
+
+```
+cargo install --git https://github.com/foundry-rs/foundry --profile local --locked forge cast chisel anvil
+```
+
+## Build Serai
+
+### Clone and Build Serai
+```
+git clone https://github.com/serai-dex/serai
+cd serai
+cargo build --release --all-features
+```
+
+## Run Tests
+
+Running tests requires:
+
+- [A rootless Docker setup](https://docs.docker.com/engine/security/rootless/)
+- A properly configured Bitcoin regtest node (available via Docker)
+- A properly configured Monero regtest node (available via Docker)
+- A properly configured monero-wallet-rpc instance (available via Docker)
+
+#### To test that you have these installed properly, run the following:
+
+To start the required Dev daemons, one may run:
+
+```
+cargo run -p serai-orchestrator -- key_gen dev
+cargo run -p serai-orchestrator -- setup dev
+```
+
+and then to deploy daemons into the dev docker network:
+
+```
+cargo run -p serai-orchestrator -- start dev bitcoin-daemon monero-daemon monero-wallet-rpc
+```
+
+Finally, to run the all the self tests:
+
+```
+cargo test --all-features
+```