Add CI job for cabal new-build

.circleci/config.yml

@@ -113,6 +113,26 @@ jobs:
       - STACK_FILE: "stack.yaml"
     <<: *defaults
 
+  cabal:
+    docker: 
+      - image: haskell/8.4.3
+    steps:
+      - checkout
+      - run: git submodule update --recursive --init
+      - restore-cache: cabal
+      - run:
+          - name: Configure
+          - command: cabal new-configure
+      - run:
+          - name: Build
+          - command: cabal new-build
+      - save_cache:
+          key: cabal
+          paths:
+            - dist
+            - new-dist
+
+
 workflows:
   version: 2
   multiple-ghcs:
@@ -122,4 +142,4 @@ workflows:
       - ghc-8.4.2
       - ghc-8.4.3
       - ghc-nightly
-
+      - cabal