add .travis.yml for Travis CI

diff --git a/.travis.yml b/.travis.yml
new file mode 100644 (file)
index 0000000..b6acdf7
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,7 @@
+sudo: required
+services:
+  - docker
+# just need bash and docker, but use c because it's probably the simplest
+language: c
+script: docker build .
+