/opt/stackstorm/virtualenvs/{pack} does not exist

[ib-ak]

I am trying to build custom pack image. however keep getting this message
/opt/stackstorm/virtualenvs/{pack} does not exist

example 1

$ docker build --build-arg PACKS="csv" --tag st2packs:temp  st2packs-image
Sending build context to Docker daemon  4.608kB
Step 1/3 : FROM stackstorm/st2packs:builder AS builder
# Executing 2 build triggers
 ---> Using cache
 ---> Running in 21ed0b91a229
Removing intermediate container 21ed0b91a229
 ---> 687ff0be7f30
Step 2/3 : RUN /opt/stackstorm/st2/bin/st2-pack-install ${PACKS}
 ---> Running in 9f6fbd0878ec
2021-02-03 15:58:20,109 INFO [-] Installing pack "csv"
2021-02-03 15:58:21,729 INFO [-] Successfully installed pack "csv"
2021-02-03 15:58:21,729 INFO [-] Setting up virtualenv for pack "csv"
2021-02-03 15:58:21,730 INFO [-] Virtualenv path "/opt/stackstorm/virtualenvs/csv" doesn't exist
2021-02-03 15:58:27,714 INFO [-] Successfully set up virtualenv for pack "csv"
Removing intermediate container 9f6fbd0878ec
 ---> 6caf196701ef
Step 3/3 : FROM stackstorm/st2packs:runtime
# Executing 3 build triggers
 ---> Using cache
 ---> 14bfee293f14
Successfully built 14bfee293f14
Successfully tagged st2packs:temp

example 2

$ docker build --build-arg PACKS="git" --tag st2packs:temp  st2packs-image
Sending build context to Docker daemon  4.608kB
Step 1/3 : FROM stackstorm/st2packs:builder AS builder
# Executing 2 build triggers
 ---> Using cache
 ---> Running in 1f0d2129905e
Removing intermediate container 1f0d2129905e
 ---> 15701667e076
Step 2/3 : RUN /opt/stackstorm/st2/bin/st2-pack-install ${PACKS}
 ---> Running in f1056a493fb9
2021-02-03 16:23:40,633 INFO [-] Installing pack "git"
2021-02-03 16:23:42,382 INFO [-] Successfully installed pack "git"
2021-02-03 16:23:42,383 INFO [-] Setting up virtualenv for pack "git"
2021-02-03 16:23:42,384 INFO [-] Virtualenv path "/opt/stackstorm/virtualenvs/git" doesn't exist
2021-02-03 16:23:49,616 INFO [-] Successfully set up virtualenv for pack "git"
Removing intermediate container f1056a493fb9
 ---> 7891e85cdeee
Step 3/3 : FROM stackstorm/st2packs:runtime
# Executing 3 build triggers
 ---> Using cache
 ---> ad54b3db93ed
Successfully built ad54b3db93ed
Successfully tagged st2packs:temp

[arm4b]

Why do you think it's an error message?

2021-02-03 16:23:42,384 INFO [-] Virtualenv path "/opt/stackstorm/virtualenvs/git" doesn't exist
2021-02-03 16:23:49,616 INFO [-] Successfully set up virtualenv for pack "git"

The end result clearly signalizes you a successfully built and tagged Docker image:

Successfully built ad54b3db93ed
Successfully tagged st2packs:temp

[ib-ak]

my understanding is that after installation, it tries to copy packs and virtualenvs folder.

2021-02-03 15:58:21,729 INFO [-] Setting up virtualenv for pack "csv"
2021-02-03 15:58:21,730 INFO [-] Virtualenv path "/opt/stackstorm/virtualenvs/csv" doesn't exist

When even though it did not gave any error during image builds, it fails during action runs.

{
  "error": "
The virtual environment (/opt/stackstorm/virtualenvs/csv) for pack \"csv\" does not exist. Normally this is
created when you install a pack using \"st2 pack install\". If you installed your pack by some other
means, you can create a new virtual environment using the command:
\"st2 run packs.setup_virtualenv packs=csv\"
",
  "traceback": "  File \"/opt/stackstorm/st2/lib/python3.6/site-packages/st2actions/container/base.py\", line 128, in _do_run
    (status, result, context) = runner.run(action_params)
  File \"/opt/stackstorm/st2/lib/python3.6/site-packages/python_runner/python_runner.py\", line 146, in run
    raise Exception(msg)
"
}