wasn't building the contracts in test

.github/workflows/test_mipsevm.yml

@@ -20,6 +20,8 @@ jobs:
       run: |
         npm install --global yarn
         yarn install
+    - name: Hardhat Compile
+      run: npx hardhat compile
     - name: Build minigeth and run default block (cache)
       run: |
         ./run.sh

mipsevm/run_evm.go

@@ -24,7 +24,8 @@ type jsoncontract struct {
 
 func GetBytecode(deployed bool) []byte {
 	var jj jsoncontract
-	mipsjson, _ := ioutil.ReadFile("../artifacts/contracts/MIPS.sol/MIPS.json")
+	mipsjson, err := ioutil.ReadFile("../artifacts/contracts/MIPS.sol/MIPS.json")
+	check(err)
 	json.NewDecoder(bytes.NewReader(mipsjson)).Decode(&jj)
 	if deployed {
 		return common.Hex2Bytes(jj.DeployedBytecode[2:])