Fix launching instances with specific image
Fix launching instances with specific image

polyverse-security/play-with-polyverse,polyverse-security/play-with-polyverse,franela/play-with-docker,play-with-docker/play-with-docker,franela/play-with-docker,franela/play-with-docker,polyverse-security/play-with-polyverse,polyverse-security/play-with-polyverse,play-with-docker/play-with-docker,franela/play-with-docker,play-with-docker/play-with-docker,play-with-docker/play-with-docker