Attempt to fix rust install

.gitlab-ci.yml

@@ -31,9 +31,7 @@ before_script:
     apt-get update -qq &&
     apt-get purge -qq binutils-doc &&
     apt-get install -qq x86-64-unknown-redox-gcc &&
-    curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain none &&
-    source "$HOME/.cargo/env" &&
-    cargo install cargo-config xargo
+    curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain none
 
 build:
     script:
@@ -45,4 +43,6 @@ build:
         git checkout "$CI_BUILD_REF" &&
         git submodule update --init --recursive &&
         source "$HOME/.cargo/env" &&
+        rustup update &&
+        cargo install cargo-config xargo &&
         make ci