Expand some commands.

.travis.yml

@@ -12,6 +12,14 @@ services:
 
 script:
   - docker run --rm --privileged multiarch/qemu-user-static:register --reset
+  # get qemu-arm-static binary
+  - mkdir tmp
+  - >
+    pushd tmp &&
+    curl -L -o qemu-arm-static.tar.gz https://github.com/multiarch/qemu-user-static/releases/download/v2.6.0/qemu-arm-static.tar.gz &&
+    tar xzf qemu-arm-static.tar.gz &&
+    popd
+  # build image
   - docker build -t jc5x/ff-test-builds:develop -f Dockerfile-ARM .
   - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
   - docker push jc5x/ff-test-builds