CI: Use unstable for now, as we need triehash package

.gitlab-ci.yml

@@ -1,4 +1,4 @@
-image: debian:testing
+image: debian:unstable
 variables:
   DEBIAN_FRONTEND: noninteractive
 

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:buster
+FROM debian:unstable
 COPY . /tmp
 WORKDIR /tmp
 RUN sed -i s#://deb.debian.org#://cdn-fastly.deb.debian.org# /etc/apt/sources.list \

shippable.yml

@@ -5,7 +5,7 @@ env:
 build:
   pre_ci_boot:
     image_name: debian
-    image_tag: buster
+    image_tag: unstable
     pull: true
   ci:
     - apt-get install -qq build-essential expect