add cirrus build

.cirrus.yml

@@ -0,0 +1,7 @@
+linux_build:    
+  docker_builder:
+    script: docker build -t $CIRRUS_REPO_FULL_NAME:cirrus-linux . -f Dockerfile
+
+rpi_build:    
+  docker_builder:
+    script: docker build -t $CIRRUS_REPO_FULL_NAME:cirrus-rpi . -f Dockerfile.rpi

README.md

@@ -1,5 +1,6 @@
 [![TravisCI](https://travis-ci.org/mpromonet/v4l2rtspserver.png)](https://travis-ci.org/mpromonet/v4l2rtspserver)
 [![CircleCI](https://circleci.com/gh/mpromonet/v4l2rtspserver.svg?style=shield)](https://circleci.com/gh/mpromonet/v4l2rtspserver)
+[![CirusCI](https://api.cirrus-ci.com/github/mpromonet/v4l2rtspserver.svg)](https://cirrus-ci.com/github/mpromonet/v4l2rtspserver)
 
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/aa0c28514aa843ea9fa7da358d905871)](https://www.codacy.com/app/michelpromonet_2643/v4l2rtspserver?utm_source=github.com&utm_medium=referral&utm_content=mpromonet/v4l2rtspserver&utm_campaign=badger)
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/4644/badge.svg)](https://scan.coverity.com/projects/4644)