Add Vss thin client protobuf generation & build/CI setup

Author: G8XSU

.github/workflows/build.yml

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+name: Continuous Integration Checks
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        toolchain: [ stable, beta ]
+        include:
+          - toolchain: stable
+            check-fmt: true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v2
+      - name: Install Protobuf compiler (protoc)
+        uses: arduino/setup-protoc@v1
+      - name: Install Rust ${{ matrix.toolchain }} toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          override: true
+          profile: minimal
+      - name: Build on Rust ${{ matrix.toolchain }}
+        run: cargo build --verbose --color always
+      - name: Check formatting
+        if: matrix.check-fmt
+        run: rustup component add rustfmt && cargo fmt --all -- --check
+      - name: Test on Rust ${{ matrix.toolchain }}
+        run: cargo test

.gitignore

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+/target
+/vss-accessor/src/proto/

Cargo.toml

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+[workspace]
+members = [
+    "vss-accessor",
+]

rustfmt.toml

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+hard_tabs = true # use tab characters for indentation, spaces for alignment
+use_field_init_shorthand = true
+max_width = 120
+use_small_heuristics = "Max"
+chain_width = 80
+fn_args_layout = "Compressed"

vss-accessor/Cargo.toml

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+[package]
+name = "vss-accessor"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+[dependencies]
+prost = "0.11.3"
+
+[dev-dependencies]
+mockito = "0.31.1"
+tokio = { version = "1.22.0"}
+
+[build-dependencies]
+prost-build = { version = "0.11.3" }
+reqwest =  { version = "0.11.13", features = ["blocking"] }

vss-accessor/build.rs

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+extern crate prost_build;
+
+use std::fs;
+use std::fs::File;
+use std::path::Path;
+
+fn main() {
+	download_file(
+		"https://raw.githubusercontent.com/lightningdevkit/vss-server/main/app/src/main/proto/vss.proto",
+		"src/proto/vss.proto",
+	)
+	.unwrap();
+
+	prost_build::compile_protos(&["src/proto/vss.proto"], &["src/"]).unwrap();
+}
+
+fn download_file(url: &str, save_to: &str) -> Result<(), Box<dyn std::error::Error>> {
+	let mut response = reqwest::blocking::get(url)?;
+	fs::create_dir_all(Path::new(save_to).parent().unwrap())?;
+	let mut out_file = File::create(save_to)?;
+	response.copy_to(&mut out_file)?;
+	Ok(())
+}