Run tests on both PostgreSQL 9.4 and 9.6 on CircleCI

.circleci/config.yml

@@ -57,7 +57,7 @@ jobs:
       - image: circleci/buildpack-deps:trusty
         environment:
           - PGHOST=localhost
-      - image: circleci/postgres:9.6.2
+      - image: circleci/postgres:9.4.14
         environment:
           - POSTGRES_USER=circleci
           - POSTGRES_DB=circleci
@@ -106,6 +106,38 @@ jobs:
             - ".stack-work"
           key: v1-stack-dependencies-{{ checksum "postgrest.cabal" }}-{{ checksum "stack.yaml" }}
 
+  build-test-9.6:
+    docker:
+      - image: circleci/buildpack-deps:trusty
+        environment:
+          - PGHOST=localhost
+      - image: circleci/postgres:9.6.2
+        environment:
+          - POSTGRES_USER=circleci
+          - POSTGRES_DB=circleci
+    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/v1.1.2/stack-1.1.2-linux-x86_64.tar.gz | tar zx -C /tmp
+            sudo mv /tmp/stack-1.1.2-linux-x86_64/stack /usr/bin
+            sudo apt-get update
+            sudo apt-get install -y libgmp-dev
+            sudo apt-get install -y postgresql-client
+            stack setup
+      - run:
+          name: build src and tests
+          command: |
+            stack build --fast -j1
+            stack build --fast --test --no-run-tests
+      - run:
+          name: run tests
+          command: POSTGREST_TEST_CONNECTION=$(test/create_test_db "postgres://circleci@localhost" postgrest_test) stack test
+
   centos6:
     <<: *build-distro-bin
 
@@ -152,9 +184,14 @@ workflows:
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
+      - build-test-9.6:
+          filters:
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*/
       - centos6:
           requires:
             - build-test
+            - build-test-9.6
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
@@ -163,6 +200,7 @@ workflows:
       - centos7:
           requires:
             - build-test
+            - build-test-9.6
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
@@ -171,6 +209,7 @@ workflows:
       - ubuntu:
           requires:
             - build-test
+            - build-test-9.6
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/
@@ -179,6 +218,7 @@ workflows:
       - ubuntui386:
           requires:
             - build-test
+            - build-test-9.6
           filters:
             tags:
               only: /v[0-9]+(\.[0-9]+)*/