ci: fix invalid yaml

Should close #354

.travis.yml

@@ -12,6 +12,9 @@ jobs:
   include:
     - stage: test
       script:
+        # Travis gets rate limited by Docker HUB.
+        - |
+          [[ -n $DOCKER_PASSWORD && -n $DOCKER_USERNAME ]] && echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
         - git ls-files --exclude='*Dockerfile' --ignored | xargs --max-lines=1 -I{} sh -c 'docker run --rm -i -v ${PWD}/.hadolint.yaml:/.hadolint.yaml hadolint/hadolint < "$1"' -- {}
         - bash -c 'shopt -s globstar; shellcheck **/*.sh'
 

build.sh

@@ -47,6 +47,11 @@ else
   fi
 fi
 
+# Travis gets rate limited by Docker HUB.
+if [[ ${CI:-} == true && -n $DOCKER_PASSWORD && -n $DOCKER_USERNAME ]]; then
+  echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+fi
+
 # shellcheck disable=SC2068
 eval docker build . ${TAGS[@]:-}
 docker images