Run everything in one job

We want to start parameterizing jobs on the version of GHC.
This is the first step.

Should also make things quicker as there's no interleaving of jobs.

.circleci/config.yml

@@ -1,6 +1,6 @@
 version: 2
 jobs:
-  compile:
+  ghc-8.2.2:
     docker:
       - image: nixorg/nix:circleci
     steps:
@@ -12,28 +12,13 @@ jobs:
           name: Restoring stack cache
       - run:
           name: Compile
-          command: nix-shell --run 'make build'
-      - persist_to_workspace:
-          root: .
-          paths:
-            - dist
+          command: nix-shell --run 'make sdist test -j2'
       - save_cache:
           key: v1-nix-{{ checksum "package.yaml" }}
           name: Caching nix
           paths:
             - /nix
 
-  doc-test:
-    docker:
-      - image: nixorg/nix:circleci
-    steps:
-      - checkout
-      - attach_workspace:
-          at: .
-      - run:
-          name: Doc test
-          command: nix-shell --run 'make test-doc-test'
-
   for-github:
     docker:
       - image: alpine
@@ -42,30 +27,11 @@ jobs:
           name: Passed
           command: echo passed
 
-  sdist:
-    docker:
-      - image: nixorg/nix:circleci
-    steps:
-      - checkout
-      - restore_cache:
-          keys:
-            - v1-nix-{{ checksum "package.yaml" }}
-            - v1-nix-
-          name: Restoring stack cache
-      - run:
-          name: Build sdist
-          command: nix-shell --run 'make sdist'
-
 workflows:
   version: 2
   base:
     jobs:
-      - compile
       - for-github:
           requires:
-            - doc-test
-            - sdist
-      - sdist
-      - doc-test:
-          requires:
-            - compile
+            - ghc-8.2.2
+      - ghc-8.2.2