Update Dockerfile

1 job for master in 1 minute and 12 seconds (queued for 1 second)
Name Stage Failure
failed
build-docker-master Build
make[2]: Entering directory '/usr/local/apache2/htdocs/renderer-src/cJSON'
make[2]: Leaving directory '/usr/local/apache2/htdocs/renderer-src/cJSON'
make[1]: Leaving directory '/usr/local/apache2/htdocs/renderer-src'
make[2]: *** No targets specified and no makefile found. Stop.
make[1]: *** [Makefile:32: cJSON] Error 2
make: *** [Makefile:27: build-renderer] Error 2
The command '/bin/sh -c make build-renderer' returned a non-zero code: 2
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 2