circleci: Break out a plain build and cache job

.circleci/config.yml

@@ -52,6 +52,40 @@ build-distro-bin: &build-distro-bin
         key: v1-{{ .Environment.CIRCLE_JOB }}-dependencies-{{ checksum "postgrest.cabal" }}-{{ checksum "stack.yaml" }}
 
 jobs:
+  build-cache:
+    docker:
+      - image: circleci/buildpack-deps:trusty
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+          - v1-stack-dependencies-{{ checksum "postgrest.cabal" }}-{{ checksum "stack.yaml" }}
+      - run:
+          name: install stack & dependencies
+          command: |
+            curl -L https://github.com/commercialhaskell/stack/releases/download/v2.1.3/stack-2.1.3-linux-x86_64.tar.gz | tar zx -C /tmp
+            sudo mv /tmp/stack-2.1.3-linux-x86_64/stack /usr/bin
+            sudo apt-get update
+            sudo apt-get install -y libgmp-dev
+            sudo apt-get install -y --only-upgrade binutils
+            sudo apt-get install -y postgresql-client
+            stack setup
+      - run:
+          name: build src and tests dependencies
+          command: |
+            stack build --fast -j1 --only-dependencies
+            stack build --fast --test --no-run-tests --only-dependencies
+      - save_cache:
+          paths:
+            - "~/.stack"
+            - ".stack-work"
+          key: v1-stack-dependencies-{{ checksum "postgrest.cabal" }}-{{ checksum "stack.yaml" }}
+      - run:
+          name: build src and tests
+          command: |
+            stack build --fast -j1
+            stack build --fast --test --no-run-tests
+
   style:
     docker:
       - image: circleci/buildpack-deps:trusty
@@ -122,11 +156,6 @@ jobs:
           command: |
             stack build --fast -j1 --only-dependencies
             stack build --fast --test --no-run-tests --only-dependencies
-      - save_cache:
-          paths:
-            - "~/.stack"
-            - ".stack-work"
-          key: v1-stack-dependencies-{{ checksum "postgrest.cabal" }}-{{ checksum "stack.yaml" }}
       - run:
           name: build src and tests
           command: |
@@ -359,6 +388,10 @@ workflows:
   version: 2
   build-test-release:
     jobs:
+      - build-cache:
+          filters:
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*/
       - style:
           filters:
             tags:
@@ -367,22 +400,32 @@ workflows:
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
+          requires:
+            - build-cache
       - build-test-9.6:
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
+          requires:
+            - build-cache
       - build-test-10:
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
+          requires:
+            - build-cache
       - build-test-11:
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
+          requires:
+            - build-cache
       - build-test-12:
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
+          requires:
+            - build-cache
       - build-prof-test:
           filters:
             tags: