test: Use hard-coded user_name in CI

The gh tool doesn't has permissions in CI and a using a hard-coded
user_name is sufficient.

.github/workflows/smoke-tests.yml

@@ -20,7 +20,6 @@ jobs:
   test:
     runs-on: ubuntu-latest
     env:
-      GH_TOKEN: ${{ github.token }}
       SSH_KEY: "./id_rsa_terraform"
       TF_VAR_private_key: "./id_rsa_terraform"
       TF_VAR_public_key: "./id_rsa_terraform.pub"

testing/smoketest/get_username.sh

@@ -1,7 +1,11 @@
 #!/bin/bash -eu
 
+: ${CI:=""}
+
+if [ -z "$CI" ]; then
+  user_name="github-actions"
 # The gh command is faster and not as hacky as the fallback solution
-if which gh >/dev/null; then
+elif which gh >/dev/null; then
   user_name=$(gh api user -q ".login")
 else
   user_name=$(ssh -T [email protected] 2>&1|cut -d'!' -f1|cut -d' ' -f2)