Create travis file for automated multi-arch builds

.travis.yml

@@ -0,0 +1,15 @@
+dist: xenial
+sudo: required
+env:
+  global:
+    - DOCKER_REPO=perara/wg-manager
+before_install:
+  - curl -fsSL https://get.docker.com | sh
+  - echo '{"experimental":"enabled"}' | sudo tee /etc/docker/daemon.json
+  - mkdir -p $HOME/.docker
+  - echo '{"experimental":"enabled"}' | sudo tee $HOME/.docker/config.json
+  - sudo service docker start
+install:
+  - docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+  - docker buildx create --name xbuilder --use
+script: bash ci.sh