ci: add a job to test release builds

Author: pietroalbini

.travis.yml

@@ -26,6 +26,10 @@ matrix:
     #  Linux builds  #
     ##################
 
+    - env: TASK=check-release-linux
+      rust: stable
+      if: branch = auto OR branch = try
+
     - env: TASK=test-linux
       rust: stable
       if: type = pull_request OR branch = auto OR branch = try

ci/run/check-release-linux.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -euo pipefail
+IFS=$'\n\t'
+
+cargo check --release
+cargo check --release --tests