Test multi arch Travis CI build configuration

.travis.yml

@@ -16,38 +16,66 @@ jobs:
   include:
     - stage: build
       rust: stable
-      script: &build-script
-        - cargo build --verbose --all
-        - cargo build --no-default-features --verbose --all
-        - cargo build --features no-color --verbose --all
+      env: TARGET=x86_64-unknown-linux-gnu
+      script: &build-script-cross
+        - cargo install cross
+        - cross build --target $TARGET --verbose --all
+        - cross build --target $TARGET --no-default-features --verbose --all
+        - cross build --target $TARGET --features no-color --verbose --all
       cache: cargo
+    - stage: build
+      rust: stable
+      env: TARGET=i686-unknown-linux-gnu
+      script: *build-script-cross
+    - stage: build
+      rust: stable
+      env: TARGET=aarch64-unknown-linux-gnu
+      script: *build-script-cross
     - stage: build
       rust: beta
-      script: *build-script
+      env: TARGET=x86_64-unknown-linux-gnu
+      script: *build-script-cross
     - stage: build
       rust: nightly
-      script: *build-script
+      env: TARGET=x86_64-unknown-linux-gnu
+      script: *build-script-cross
     - stage: build
       rust: stable
       os: osx
-      script: *build-script
+      env: TARGET=x86_64-unknown-linux-gnu
+      script:
+        - cargo build --verbose --all
+        - cargo build --no-default-features --verbose --all
+        - cargo build --features no-color --verbose --all
     - stage: test
+      env: TARGET=x86_64-unknown-linux-gnu
       script: cargo test --verbose --all
       cache: cargo
     - stage: release
-      script: skip
+      env: TARGET=x86_64-unknown-linux-gnu
+      script:
+        - cargo install cross
+        - cross build --target $TARGET --release --verbose --all
+        - cd target/release
+        - tar -czvf $TRAVIS_BUILD_DIR/ffsend-linux-x86_64.tar.gz ffsend
+        - cd $TRAVIS_BUILD_DIR
       deploy:
         provider: releases
         api_key: $GITHUB_OAUTH_TOKEN
         skip_cleanup: true
+        overwrite: false
+        file: ffsend-x86_64-linux.tar.gz
         on:
           tags: true
           branch: master
+      cache: cargo
     - stage: release
       script:
         - echo $CARGO_TOKEN | cargo login
         - cargo publish --verbose
       cache: cargo
 
+# TODO: more architectures
+# TODO: release a build for each architecture
 # TODO: enfore the git tag/crate version equality for releases
 # TODO: disable addons/rust installation for GitHub release job