Use the exact CI build image hash when building releases, include unzip

Author: jgriffiths

.gitlab-ci.yml

@@ -1,5 +1,5 @@
 build_tag_release:
-  image: greenaddress/wallycore:fc18366c4da94ea7fe328650709e39a1133595f4b998b9c992f700c4f392c1e7
+  image: greenaddress/wallycore@sha256:48a02e07aa1264a549413c2c2f765d183c53d660b450db245d2444751622cd21
   artifacts:
     name: wallycore-android-jni
     when: on_success

contrib/stretch_deps.sh

@@ -13,7 +13,7 @@ update-java-alternatives -s java-1.8.0-openjdk-amd64
 
 cd /opt && curl -sSO https://dl.google.com/android/repository/${NDK_FILENAME} && unzip -qq ${NDK_FILENAME} && rm ${NDK_FILENAME}
 
-apt-get remove --purge curl unzip -yqq
+apt-get remove --purge curl -yqq
 apt-get -yqq autoremove
 apt-get -yqq clean
 rm -rf /var/lib/apt/lists/* /var/cache/* /tmp/* /usr/share/locale/* /usr/share/man /usr/share/doc /lib/xtables/libip6*