add opencv in the host section

2 jobs from openpose in 73 minutes 38 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed #139028
docker
build_linux

01:13:28

canceled #139029
macosx
build_macosx

00:10

 
Build build_linux
(12:36:38.582) export CURL_CA_BUNDLE=/local/builds/bob/bob.conda/_ci/cacert.pem
(12:36:38.584) export SSL_CERT_FILE=/local/builds/bob/bob.conda/_ci/cacert.pem
(12:36:38.585) export GIT_SSL_CAINFO=/local/builds/bob/bob.conda/_ci/cacert.pem
(12:36:38.586) export DOC_SERVER_PREFIX=public-upload/docs/bob/bob.conda
(12:36:38.587) DOC_UPLOADS=public-upload/docs/bob/bob.conda/openpose/
(12:36:38.588) export LANG=en_US.UTF-8
(12:36:38.589) export LC_ALL=en_US.UTF-8
(12:36:38.590) export MATPLOTLIBRC=/local/builds/bob/bob.conda/_ci
ERROR: Job failed: exit code 1