Simplify `dump_artifacts.sh` script
There was a lot of extra stuff the script was doing that wasn't
necessary.
##########
set -euo pipefail
-REPOSITORY_ROOT=$(git rev-parse --show-toplevel)
-readonly REPOSITORY_ROOT
+NOMAD_ADDRESS=$(pulumi stack output address --stack="grapl/nomad/testing")
+export NOMAD_ADDRESS
-readonly STACK="grapl/nomad/testing"
-_NOMAD_ADDRESS=$(pulumi stack output address --stack="${STACK}")
-readonly _NOMAD_ADDRESS
-
-cd "${REPOSITORY_ROOT}"
# dump-artifacts is a Grapl custom alias defined in pants.toml
-NOMAD_ADDRESS="${_NOMAD_ADDRESS}" ./pants dump-artifacts --no-dump-agent-logs
+./pants dump-artifacts --no-dump-agent-logs
