[k8s] Fix for spaces and equals signs in docker env vars #3322
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Closes #3320. Our parsing for k8s envvars -> ssh envvars would break if the envvar value contained equals signs or spaces. This PR fixes it.
Example, if the env is set as
ENV GIT_SSH_COMMAND="ssh -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedKeyTypes=+ssh-rsa"
.Before, our custom envs script would contain:
After (handles equals sign, adds quotes to handle spaces):
Tested (run the relevant ones):
GIT_SSH_COMMAND
environment variable #3320.