Replace ganache with hardhat

To fix hanging tests.

.gitignore

@@ -9,3 +9,8 @@ build/
 *.la
 *.exe
 *.dll
+
+node_modules
+nohup.out
+hardhat.config.js
+package-lock.json

ci-test.sh

@@ -1,8 +1,9 @@
 #!/bin/sh
 
 set -ex
-npm install ganache-cli
-nohup ./node_modules/.bin/ganache-cli -s 0 &
+npm install hardhat
+touch hardhat.config.js
+nohup npx hardhat node &
 nimble install -y
 
 # Wait until ganache responds