tests/run: Inject the SSH key via the YAML config

The TF_VAR_* approach to SSH handling dates back to the initial script
from a2405e4 (run smoke tests with bash script, 2018-06-18,
coreos/tectonic-installer#3284).  But since the current installer
(installer/cmd/tectonic) and the next-gen installer
(cmd/openshift-install) have established channels for passing in the
SSH public key, there's no need to reach around and poke Terraform
directly.

I'm loading the file content from Python to avoid issues with escaping
strings that are passed in via POSIX parameter expansion.

tests/run.sh

@@ -36,6 +36,12 @@ cp bazel-bin/tests/smoke/linux_amd64_stripped/go_default_test tectonic-dev/smoke
 export PATH="${PWD}/tectonic-dev/installer:${PATH}"
 cd tectonic-dev
 
+### HANDLE SSH KEY ###
+if [ ! -f ~/.ssh/id_rsa.pub ]; then
+  echo -e "\\e[36m Generating SSH key-pair...\\e[0m"
+  ssh-keygen -qb 2048 -t rsa -f ~/.ssh/id_rsa -N "" </dev/zero
+fi
+
 if test -z "${AWS_REGION+x}"
 then
   echo -e "\\e[36m Calculating the AWS region...\\e[0m"
@@ -59,13 +65,16 @@ CONFIGURE_AWS_ROLES=False
 echo -e "\\e[36m Creating Tectonic configuration...\\e[0m"
 python <<-EOF >"${CLUSTER_NAME}.yaml"
 	import datetime
+	import os.path
 	import sys
 
 	import yaml
 
 	with open('examples/tectonic.aws.yaml') as f:
 	    config = yaml.load(f)
 	config['name'] = '${CLUSTER_NAME}'
+	with open(os.path.expanduser(os.path.join('~', '.ssh', 'id_rsa.pub'))) as f:
+	    config['admin']['sshKey'] = f.read()
 	config['baseDomain'] = '${DOMAIN}'
 	config['pullSecretPath'] = '${PULL_SECRET_PATH}'
 	config['aws']['region'] = '${AWS_REGION}'
@@ -83,13 +92,6 @@ python <<-EOF >"${CLUSTER_NAME}.yaml"
 echo -e "\\e[36m Initializing Tectonic...\\e[0m"
 tectonic init --config="${CLUSTER_NAME}".yaml
 
-### HANDLE SSH KEY ###
-if [ ! -f ~/.ssh/id_rsa.pub ]; then
-  echo -e "\\e[36m Generating SSH key-pair...\\e[0m"
-  ssh-keygen -qb 2048 -t rsa -f ~/.ssh/id_rsa -N "" </dev/zero
-fi
-export TF_VAR_tectonic_admin_ssh_key="$(cat ~/.ssh/id_rsa.pub)"
-
 echo -e "\\e[36m Deploying Tectonic...\\e[0m"
 tectonic install --dir="${CLUSTER_NAME}"
 echo -e "\\e[36m Running smoke test...\\e[0m"