remove config.toml with rustflags, replace with release script

.cargo/config.toml

@@ -1,3 +0,0 @@
-[target.x86_64-unknown-linux-gnu]
-linker = "clang"
-rustflags = ["-C", "link-arg=-fuse-ld=mold", "-C", "target-cpu=skylake", '--cfg=curve25519_dalek_backend="simd"', '--cfg=feature="precomputed-tables"']

build-release.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+export RUSTFLAGS="-C link-arg=-fuse-ld=mold -C target-cpu=skylake"
+cargo build --release -p signal-gateway-bin