Add nightly CI run with the most important jobs

Author: cameel

.circleci/config.yml

@@ -5,7 +5,7 @@ defaults:
 
 workflows:
   version: 2.1
-  node-multi-build:
+  pr-checks:
     jobs:
       - check-coding-style
       - node-v10
@@ -23,6 +23,24 @@ workflows:
       - cli-smoke-test: *requires_package
       - solidity-solcjs-ext-test
 
+  nightly:
+    triggers:
+      - schedule:
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master
+
+    jobs:
+      - node-current
+      - build-package
+      - hardhat-core-default-solc: *requires_package
+      - hardhat-core-latest-solc: *requires_package
+      - hardhat-sample-project: *requires_package
+      - cli-smoke-test: *requires_package
+      - solidity-solcjs-ext-test
+
 version: 2.1
 
 orbs: