use SSI variables on release builds (#4571)

* use SSI variables in CI

* add SSI env var guards in guardrails tests

* only run in SSI mode on release

integration-tests/init.spec.js

@@ -21,6 +21,11 @@ const { engines } = require('../package.json')
 const supportedRange = engines.node
 const currentVersionIsSupported = semver.satisfies(process.versions.node, supportedRange)
 
+// These are on by default in release tests, so we'll turn them off for
+// more fine-grained control of these variables in these tests.
+delete process.env.DD_INJECTION_ENABLED
+delete process.env.DD_INJECT_FORCE
+
 function testInjectionScenarios (arg, filename, esmWorks = false) {
   if (!currentVersionIsSupported) return
   const doTest = (file, ...args) => testFile(file, ...args)

integration-tests/package-guardrails.spec.js

@@ -13,6 +13,11 @@ const DD_TRACE_DEBUG = 'true'
 const DD_INJECTION_ENABLED = 'tracing'
 const DD_LOG_LEVEL = 'error'
 
+// These are on by default in release tests, so we'll turn them off for
+// more fine-grained control of these variables in these tests.
+delete process.env.DD_INJECTION_ENABLED
+delete process.env.DD_INJECT_FORCE
+
 describe('package guardrails', () => {
   useEnv({ NODE_OPTIONS })
   const runTest = (...args) =>

packages/dd-trace/test/setup/core.js

@@ -42,3 +42,9 @@ if (global.describe && typeof global.describe.skip !== 'function') {
 }
 
 process.env.DD_INSTRUMENTATION_TELEMETRY_ENABLED = 'false'
+
+// If this is a release PR, set the SSI variables.
+if (/^v\d+\.x$/.test(process.env.GITHUB_BASE_REF || '')) {
+  process.env.DD_INJECTION_ENABLED = 'true'
+  process.env.DD_INJECT_FORCE = 'true'
+}