perf: cache enterprise installation ID to avoid repeated lookups

Store the enterprise installation ID after the first successful lookup
so subsequent calls to enrichContextWithEnterprise can skip the
listInstallations API call and directly call robot.auth(cachedId).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: decyjphr

index.js

@@ -12,6 +12,7 @@ let deploymentConfig
 
 module.exports = (robot, { getRouter }, Settings = require('./lib/settings')) => {
   let appSlug = 'safe-settings'
+  let cachedEnterpriseInstallationId = null
   async function syncAllSettings (nop, context, repo = context.repo(), ref, baseRef, changedFiles = {}) {
     try {
       deploymentConfig = await loadYamlFileSystem()
@@ -159,6 +160,12 @@ module.exports = (robot, { getRouter }, Settings = require('./lib/settings')) =>
     if (enterprise && enterprise.slug) {
       context.enterpriseSlug = enterprise.slug
       try {
+        // Use cached enterprise installation ID if available
+        if (cachedEnterpriseInstallationId) {
+          context.appGithub = await robot.auth(cachedEnterpriseInstallationId)
+          return
+        }
+
         // Get a JWT-authenticated client to list all installations
         const appGithub = await robot.auth()
         const installations = await appGithub.paginate(
@@ -169,7 +176,8 @@ module.exports = (robot, { getRouter }, Settings = require('./lib/settings')) =>
           i => i.target_type === 'Enterprise' && i.account && i.account.slug === enterprise.slug
         )
         if (enterpriseInstallation) {
-          context.appGithub = await robot.auth(enterpriseInstallation.id)
+          cachedEnterpriseInstallationId = enterpriseInstallation.id
+          context.appGithub = await robot.auth(cachedEnterpriseInstallationId)
         } else {
           robot.log.debug(`No enterprise installation found for slug '${enterprise.slug}'. App installation management will not be available.`)
         }