Run multiple OTP vsns in CI

.circleci/config.yml

@@ -2,6 +2,12 @@ version: 2.1
 
 executors:
   aebuilder:
+    docker:
+      - image: aeternity/builder:bionic-otp24
+        user: builder
+    environment:
+      ERLANG_ROCKSDB_BUILDOPTS: "-j2"
+  aebuilder23:
     docker:
       - image: aeternity/builder:bionic-otp23
         user: builder
@@ -14,3 +20,12 @@ jobs:
     steps:
       - checkout
       - run: make test
+      - store_artifacts:
+          path: _build/test/logs
+  build-otp23:
+    executor: aebuilder23
+    steps:
+      - checkout
+      - run: make test
+      - store_artifacts:
+          path: _build/test/logs