update script to not print null values

[rowansmithhc]

Added a select(.value != "") entry to the jq statement to avoid it printing null values. This is to make life easier when copy/pasting the output from the script.

This solves the problem of people overwriting existing values they already may have set and do not want overwritten, namely VAULT_ADDR and VAULT_TOKEN.

before:

➜  enos git:(main) ✗ bash scripts/test_e2e_env.sh               
export BOUNDARY_ADDR='http://some-address:9200'
export BOUNDARY_LICENSE=''
export E2E_AWS_ACCESS_KEY_ID=''
export E2E_AWS_BUCKET_NAME=''
export E2E_AWS_HOST_SET_FILTER=''
export E2E_AWS_HOST_SET_FILTER2=''
export E2E_AWS_HOST_SET_IPS='[""]'
export E2E_AWS_HOST_SET_IPS2='[""]'
export E2E_AWS_REGION=''
export E2E_AWS_SECRET_ACCESS_KEY=''
export E2E_MAX_PAGE_SIZE='10'
export E2E_PASSWORD_ADMIN_LOGIN_NAME='admin'
export E2E_PASSWORD_ADMIN_PASSWORD='xdBht'
export E2E_PASSWORD_AUTH_METHOD_ID='ampw_UI0wkZdCfJ'
export E2E_SSH_CA_KEY=''
export E2E_SSH_KEY_PATH='/Users/something.pem'
export E2E_SSH_USER='ubuntu'
export E2E_TARGET_ADDRESS='10.13.1.254'
export E2E_TARGET_PORT='22'
export E2E_TESTS='true'
export E2E_VAULT_ADDR=''
export E2E_WORKER_ADDRESS=''
export E2E_WORKER_TAG_EGRESS=''
export E2E_WORKER_TAG_INGRESS=''
export VAULT_ADDR=''
export VAULT_TOKEN=''

after:

➜  enos git:(main) ✗ bash scripts/test_e2e_env.sh               
export BOUNDARY_ADDR='http://some-address:9200'
export E2E_AWS_HOST_SET_IPS='[""]'
export E2E_AWS_HOST_SET_IPS2='[""]'
export E2E_MAX_PAGE_SIZE='10'
export E2E_PASSWORD_ADMIN_LOGIN_NAME='admin'
export E2E_PASSWORD_ADMIN_PASSWORD='xdBht'
export E2E_PASSWORD_AUTH_METHOD_ID='ampw_UI0wkZdCfJ'
export E2E_SSH_CA_KEY=''
export E2E_SSH_KEY_PATH='/Users/something.pem'
export E2E_SSH_USER='ubuntu'
export E2E_TARGET_ADDRESS='10.13.1.254'
export E2E_TARGET_PORT='22'
export E2E_TESTS='true'

[moduli]

Nice change! Thanks!