P9 cloud task: install gcc (linker for the Rust build); guide: kernel installation

scripts/cloud/tasks/p9.sh

@@ -10,6 +10,7 @@ W=/work/p9; R=$OUT/p9; mkdir -p $W $R
 N=$(nproc)
 
 echo "=== build simurg-core $(date -u +%T) ==="
+DEBIAN_FRONTEND=noninteractive apt-get install -y -q gcc > /dev/null  # Rust links through the C toolchain
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal > /dev/null 2>&1
 export PATH="$HOME/.cargo/bin:$PATH"
 rustc --version