fix(CI): read Vault secrets by field-agnostic import in Windows smoke job

.semaphore/smoke-tests.yml

@@ -64,9 +64,52 @@ blocks:
             # following the pattern from cli-release/.semaphore/4-release-cli.yml).
             - $Env:VAULT_ADDR = "https://vault.cireops.gcp.internal.confluent.cloud"
             - vault login -no-print token=$(vault write -field=token "auth/semaphore_self_hosted/login" role="default" jwt="$Env:SEMAPHORE_OIDC_TOKEN")
-            - $Env:CONFLUENT_CLOUD_EMAIL = (vault kv get -field=CONFLUENT_CLOUD_EMAIL v1/ci/kv/apif/cli/live-testing-data)
-            - $Env:CONFLUENT_CLOUD_PASSWORD = (vault kv get -field=CONFLUENT_CLOUD_PASSWORD v1/ci/kv/apif/cli/live-testing-data)
-            - $Env:SLACK_WEBHOOK_URL = (vault kv get -field=SLACK_WEBHOOK_URL v1/ci/kv/apif/cli/slack-notifications-live-testing)
+            # These secrets keep everything in a single field named "script", whose value is
+            # a shell script of `export NAME=value` lines. That is why asking for
+            # `-field=CONFLUENT_CLOUD_EMAIL` failed with `Field "CONFLUENT_CLOUD_EMAIL" not
+            # present in secret` -- no such field exists. The linux/arm64 job above sources
+            # that script; PowerShell cannot, so parse the assignments out of it instead.
+            # Only the variables the job needs are exported, so anything else these secrets
+            # define never reaches the environment of `go test` and its children.
+            # Values are never echoed; only variable names appear, and only on failure.
+            - |
+              function Import-VaultScript($Path, $Names) {
+                # Check the exit code before touching the output: on a partial response,
+                # downstream errors could echo the input, which holds secrets.
+                $exports = vault kv get -field=script $Path
+                if ($LASTEXITCODE -ne 0) { throw "failed to read Vault secret $Path" }
+
+                # Hashtable keys are case-insensitive, so the lookups below still succeed if
+                # the script happens to declare these names under a different case.
+                $defined = @{}
+                foreach ($line in ($exports -split "\r?\n")) {
+                  if ($line -match '^\s*(?:export\s+)?([A-Za-z_][A-Za-z0-9_]*)\s*=\s*(.*)$') {
+                    $name = $Matches[1]
+                    $value = $Matches[2].Trim()
+
+                    # Strip one layer of surrounding quotes, as `source` would.
+                    foreach ($quote in '"', "'") {
+                      if ($value.Length -ge 2 -and $value.StartsWith($quote) -and $value.EndsWith($quote)) {
+                        $value = $value.Substring(1, $value.Length - 2)
+                        break
+                      }
+                    }
+                    $defined[$name] = $value
+                  }
+                }
+
+                # Fail here rather than 20 minutes later inside `go test`, which would only
+                # report "required environment variable ... is not set".
+                foreach ($name in $Names) {
+                  if (-not $defined.ContainsKey($name) -or [string]::IsNullOrEmpty($defined[$name])) {
+                    throw "secret $Path does not define $name (defines: $(($defined.Keys | Sort-Object) -join ', '))"
+                  }
+                  [Environment]::SetEnvironmentVariable($name, $defined[$name])
+                }
+              }
+
+              Import-VaultScript v1/ci/kv/apif/cli/live-testing-data @("CONFLUENT_CLOUD_EMAIL", "CONFLUENT_CLOUD_PASSWORD")
+              Import-VaultScript v1/ci/kv/apif/cli/slack-notifications-live-testing @("SLACK_WEBHOOK_URL")
 
             # Install Go (matches the pattern in semaphore.yml; chocolatey is community-maintained)
             - $ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest -OutFile Go.zip -Uri https://go.dev/dl/go$(Get-Content .go-version).windows-amd64.zip -UseBasicParsing