add ci infrastructure

Dockerfile

@@ -0,0 +1,11 @@
+FROM progrium/busybox
+
+RUN opkg-install ca-certificates
+
+# satisfy go crypto/x509
+RUN for cert in `ls -1 /etc/ssl/certs/*.crt | grep -v /etc/ssl/certs/ca-certificates.crt`; \
+      do cat "$cert" >> /etc/ssl/certs/ca-certificates.crt; \
+    done
+
+ADD built-check /opt/resource/check
+ADD built-out /opt/resource/out