Implement passing over an additional env file

[xek]

Enable passing an additional heat environment file
to the standalone or tripleo deploy scripts.

Jira: https://issues.redhat.com/browse/OSPRH-19960

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Build failed (check pipeline). Post recheck (without leading slash)
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https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/caa7752529d844df8b46d672a5277978

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 41m 44s
✔️ install-yamls-crc-podified-edpm-baremetal SUCCESS in 1h 25m 23s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 20m 15s
❌ adoption-standalone-to-crc-ceph-provider FAILURE in 39m 48s
❌ adoption-standalone-to-crc-no-ceph-provider FAILURE in 37m 54s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/6c1fa5f5d19a4a22bc09ea04ce4c873f

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 41m 26s
✔️ install-yamls-crc-podified-edpm-baremetal SUCCESS in 1h 28m 16s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 17m 18s
❌ adoption-standalone-to-crc-ceph-provider FAILURE in 38m 23s
❌ adoption-standalone-to-crc-no-ceph-provider FAILURE in 36m 37s