add --version flag

build.sh

@@ -1,5 +1,12 @@
 #!/bin/sh
 
+rm webTemplate-*
+
+version="$(cat Cargo.toml | grep '^version' | sed -e 's/^.*"\([^"]*\)".*$/\1/')"
+commit="$(git show --oneline -s | sed -e 's/ .*$//')"
+dirty="$(test "$(git diff --shortstat 2> /dev/null | tail -n1)" == "" || echo -n "_drity" )"
+echo "pub const VERSION: &'static str = \"${version} (${commit}${dirty})\";" >src/version.rs
+
 cross build --target aarch64-unknown-linux-gnu --release
 cargo build --release