Build parachains (#207)

* Fix build of test-chains.

* Add test-chains into build and publish scripts

polkadot/parachain/test-chains/build.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+set -e
+
+rm -rf ./target
+for i in */
+do
+  i=${i%/}
+  cd $i
+
+  RUSTFLAGS="-C link-arg=--import-memory" cargo +nightly build --target=wasm32-unknown-unknown --release --no-default-features
+  wasm-gc target/wasm32-unknown-unknown/release/$i.wasm ../../tests/res/$i.wasm
+  cd ..
+done