Remove release creation race in build helper (#1133)

There was a race condition in the Build Helper where if multiple runners
got to the "Create draft release" step at the same time, we could get
duplicate releases created. Now, each of the build runners will upload
the artifacts to the workflow artifact feed. Then, a single runner will
create the draft release.

.github/workflows/build-helper.yml

@@ -147,6 +147,7 @@ jobs:
                   STATIC_DOCSITE_PATH: ${{env.STATIC_DOCSITE_PATH}}
               shell: powershell # electron-builder's Windows code signing package has some compatibility issues with pwsh, so we need to use Windows Powershell
 
+            # Upload artifacts to the S3 staging and to the workflow output for the draft release job
             - name: Upload to S3 staging
               if: github.event_name != 'workflow_dispatch'
               run: task artifacts:upload
@@ -154,8 +155,21 @@ jobs:
                   AWS_ACCESS_KEY_ID: "${{ secrets.ARTIFACTS_KEY_ID }}"
                   AWS_SECRET_ACCESS_KEY: "${{ secrets.ARTIFACTS_KEY_SECRET }}"
                   AWS_DEFAULT_REGION: us-west-2
+            - name: Upload artifacts
+              uses: actions/upload-artifact@v4
+              with:
+                  name: ${{ matrix.runner }}
+                  path: make
+    create-release:
+        runs-on: ubuntu-latest
+        if: ${{ github.event_name != 'workflow_dispatch' }}
+        steps:
+            - name: Download artifacts
+              uses: actions/download-artifact@v4
+              with:
+                  path: make
+                  merge-multiple: true
             - name: Create draft release
-              if: github.event_name != 'workflow_dispatch'
               uses: softprops/action-gh-release@v2
               with:
                   prerelease: ${{ contains(github.ref_name, '-beta') }}
@@ -173,9 +187,3 @@ jobs:
                       make/*.snap
                       make/*.flatpak
                       make/*.AppImage
-            - name: Upload build artifacts to workflow (manual runs only)
-              if: github.event_name == 'workflow_dispatch'
-              uses: actions/upload-artifact@v4
-              with:
-                  name: ${{matrix.runner}}
-                  path: make