Try the bionic docker image

Author: asomers

.cirrus.yml

@@ -52,10 +52,14 @@ task:
       #env:
         #TARGET: mipsel-unknown-linux-gnu
   container:
-    image: rust:1.36
+    image: ubuntu:bionic
+    #image: rust:1.36
   setup_script:
     - apt search docker
     - apt-get install docker
+    - curl --proto '=https' --tlsv1.2 -sSf -o rustup.sh https://sh.rustup.rs
+    - sh rustup.sh -y --profile=minimal --default-toolchain 1.36.0
+    - . $HOME/.cargo/env
     - bash ci/install.sh
   script:
     - . $HOME/.cargo/env || true