ci: upload build effective cache hit rate stats to Datadog (#48532)

* ci: upload build effective cache hit rate stats to Datadog

Co-authored-by: David Sanders <dsanders11@ucsbalum.com>

* ci: fix release branch name in build stats script

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: David Sanders <dsanders11@ucsbalum.com>

.github/actions/build-electron/action.yml

@@ -63,6 +63,13 @@ runs:
         NINJA_SUMMARIZE_BUILD=1 e build
         cp out/Default/.ninja_log out/electron_ninja_log
         node electron/script/check-symlinks.js
+
+        # Upload build stats to Datadog
+        if ! [ -z $DD_API_KEY ]; then
+          npx node electron/script/build-stats.mjs out/Default/siso.INFO --upload-stats || true
+        else
+          echo "Skipping build-stats.mjs upload because DD_API_KEY is not set"
+        fi
     - name: Build Electron dist.zip ${{ inputs.step-suffix }}
       shell: bash
       run: |

.github/workflows/pipeline-segment-electron-build.yml

@@ -66,6 +66,7 @@ concurrency:
 env:
   CHROMIUM_GIT_COOKIE: ${{ secrets.CHROMIUM_GIT_COOKIE }}
   CHROMIUM_GIT_COOKIE_WINDOWS_STRING: ${{ secrets.CHROMIUM_GIT_COOKIE_WINDOWS_STRING }}
+  DD_API_KEY: ${{ secrets.DD_API_KEY }}
   ELECTRON_ARTIFACTS_BLOB_STORAGE: ${{ secrets.ELECTRON_ARTIFACTS_BLOB_STORAGE }}
   ELECTRON_RBE_JWT: ${{ secrets.ELECTRON_RBE_JWT }}
   SUDOWOODO_EXCHANGE_URL: ${{ secrets.SUDOWOODO_EXCHANGE_URL }}
@@ -84,6 +85,7 @@ jobs:
     environment: ${{ inputs.environment }}
     env:
       TARGET_ARCH: ${{ inputs.target-arch }}
+      TARGET_PLATFORM: ${{ inputs.target-platform }}
     steps:
     - name: Create src dir
       run: |