build,circleci: add 'time' to container build image

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

.circleci/Dockerfile

@@ -10,6 +10,7 @@ libncurses5-dev \
 libssl-dev \
 python \
 subversion \
+time \
 zlib1g-dev \
 && rm -rf /var/lib/apt/lists/*
 

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2.0
 jobs:
   build:
     docker:
-      - image: champtar/openwrtpackagesci@sha256:4d8bea09b6fd51e015f417a8f0056b914d0db6aa9829b0049065a077f52a91e9
+      - image: champtar/openwrtpackagesci@sha256:82026d8d33fc9e40472c63d4512b8da2da3f6da082f2b682d55540acfb1f7fa5
     environment:
       - SDK_BASE_URL: "https://downloads.lede-project.org/snapshots/targets/ar71xx/generic"
       - SDK_FILE: "openwrt-sdk-ar71xx-generic_gcc-7.3.0_musl.Linux-x86_64.tar.xz"