Use travis to build/release Linux binaries

Only does the deploy phase for tagged commits

Contributes towards luvit#200

.travis.yml

@@ -34,3 +34,28 @@ notifications:
     on_success: change  # options: [always|never|change] default: always
     on_failure: always  # options: [always|never|change] default: always
     on_start: false     # default: false
+
+jobs:
+  include:
+    - stage: deploy
+      if: tag IS present
+      os: linux
+      env: []
+      script:
+        # fetch tags so that git describe works
+        - git fetch --unshallow
+        - make linux-build
+      services:
+        - docker
+      deploy:
+        provider: releases
+        api_key: $GITHUB_OAUTH_TOKEN
+        file:
+          - "luvi-regular-Linux_x86_64"
+          - "luvi-tiny-Linux_x86_64"
+          - "luvi-regular-Linux_i686"
+          - "luvi-tiny-Linux_i686"
+        overwrite: true
+        skip_cleanup: true
+        on:
+          tags: true