Change to koalaman/shellcheck-alpine based image. Shellcheck getsslD.

.circleci/config.yml

@@ -2,9 +2,10 @@ versio: 2
 jobs:
   build:
     docker:
-      - image: djschaper/circleci:1.0-alpine3.7
+      - image: djschaper/circleci:1.1-alpine3.7sc
     environment:
       - CIRCLE_BRANCH: integration/circleci
+    shell: /bin/ash
     working_directory: /srv/getsslD
     steps:
       - run:
@@ -20,5 +21,7 @@ jobs:
           command: cp /srv/getsslD/getsslD /bin/
       - run:
           name: Test initial script run
-          shell: /bin/ash
           command: getsslD
+      - run:
+          name: Shellcheck getsslD
+          command: shellcheck /srv/getsslD/getsslD