MINIFICPP-1894 fixing DOCKER_BASE_IMAGE flag

Closes #1380
Signed-off-by: Marton Szasz <szaszm@apache.org>
diff --git a/docker/DockerBuild.sh b/docker/DockerBuild.sh
index 527e148..82b0939 100755
--- a/docker/DockerBuild.sh
+++ b/docker/DockerBuild.sh
@@ -85,11 +85,11 @@
       if [ "${ARR[0]}" == "BUILD_NUMBER" ]; then
         BUILD_NUMBER="${ARR[1]}"
       elif [ "${ARR[0]}" == "DOCKER_BASE_IMAGE" ]; then
-        BUILD_ARGS+=("--build-arg BASE_ALPINE_IMAGE=${ARR[1]}")
+        BUILD_ARGS+=("--build-arg" "BASE_ALPINE_IMAGE=${ARR[1]}")
       elif [ "${ARR[0]}" == "DOCKER_CCACHE_DUMP_LOCATION" ]; then
         DOCKER_CCACHE_DUMP_LOCATION="${ARR[1]}"
       else
-        BUILD_ARGS+=("--build-arg ${ARR[0]}=${ARR[1]}")
+        BUILD_ARGS+=("--build-arg" "${ARR[0]}=${ARR[1]}")
       fi
     fi
     shift