ci: add weekly Development + Shipping Windows game builds

Scheduled (weekly) + manual workflow that cooks/stages/packages standalone
Windows builds in both Development and Shipping configurations via a matrix,
publishing each to gs://.../builds/windows/<config>/. Platform is a matrix
axis mapped to a runner label, so Linux/Mac just need their own runner + a
matrix entry later.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/weekly-game-build.yml

@@ -0,0 +1,81 @@
+# Gitea Actions — weekly PACKAGED GAME builds (cooked, staged, standalone).
+# Produces Development AND Shipping Windows builds and publishes each to the
+# artifacts bucket. This is the shippable/playtest artifact, distinct from the
+# per-push editor binaries (build-editor.yml).
+#
+# PLATFORM EXPANSION: platform is modeled as a matrix axis mapped to a runner
+# label. Windows builds on the `windows` host-mode runner. To add Linux/Mac later:
+#   1) stand up a runner on a Linux/Mac machine (labels `linux` / `macos`),
+#   2) add an entry to the matrix below ({ os: linux, platform: Linux, ... }).
+# No other changes needed — the BuildGraph target is platform-parameterized.
+name: Weekly Game Build
+
+on:
+  schedule:
+    - cron: '0 6 * * 1'      # Mondays 06:00 UTC — adjust to your cadence
+  workflow_dispatch:          # manual "build now"
+
+concurrency:
+  group: weekly-game-build
+  cancel-in-progress: false   # don't kill an in-flight cook with a new trigger
+
+jobs:
+  package:
+    strategy:
+      fail-fast: false        # a Shipping failure shouldn't cancel Development
+      matrix:
+        include:
+          - { os: windows, platform: Win64, configuration: Development }
+          - { os: windows, platform: Win64, configuration: Shipping }
+    runs-on: ${{ matrix.os }}
+    env:
+      UE_ROOT: D:\Unreal\UE_5.7
+      PROJECT_NAME: ASGCGameJam2026
+      ARTIFACTS_BUCKET: keystone-501223-build-artifacts
+      BUILDGRAPH_SCRIPT: D:\asgcgj\build-infra\buildgraph\BuildEditor.xml
+      GCLOUD_BIN: C:\Users\aorti\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin
+    steps:
+      # Packaged builds COOK content, so LFS is required (unlike editor binaries).
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+
+      - name: Compute canonical BUILD_ID
+        shell: powershell
+        run: |
+          $short = "$env:GITHUB_SHA".Substring(0,8)
+          $buildId = "${{ matrix.configuration }}-$env:GITHUB_REF_NAME-$short"
+          "BUILD_ID=$buildId" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
+          Write-Host "BUILD_ID=$buildId"
+
+      - name: BuildGraph — packaged game (${{ matrix.configuration }} / ${{ matrix.platform }})
+        shell: powershell
+        run: |
+          & "$env:UE_ROOT\Engine\Build\BatchFiles\RunUAT.bat" BuildGraph `
+            -Script="$env:BUILDGRAPH_SCRIPT" `
+            -Target="PackagedGame" `
+            -set:ProjectName=$env:PROJECT_NAME `
+            -set:ProjectDir="$env:GITHUB_WORKSPACE" `
+            -set:ProjectPath="$env:GITHUB_WORKSPACE\$env:PROJECT_NAME.uproject" `
+            -set:Platform=${{ matrix.platform }} `
+            -set:Configuration=${{ matrix.configuration }} `
+            -set:BuildVersion=$env:BUILD_ID `
+            -set:OutputDir="$env:GITHUB_WORKSPACE\LocalBuilds"
+          if ($LASTEXITCODE -ne 0) { throw "BuildGraph failed ($LASTEXITCODE)" }
+
+      - name: Publish packaged build
+        shell: powershell
+        run: |
+          $env:PATH += ";$env:GCLOUD_BIN"
+          $cfg = "${{ matrix.configuration }}".ToLower()
+          $plat = "${{ matrix.os }}"
+          $zip = "$env:GITHUB_WORKSPACE\LocalBuilds\$env:PROJECT_NAME-${{ matrix.platform }}-${{ matrix.configuration }}.zip"
+          if (-not (Test-Path $zip)) { throw "Packaged zip not found: $zip" }
+          $sha = "$env:GITHUB_SHA".Substring(0,8)
+          $base = "gs://$env:ARTIFACTS_BUCKET/builds/$plat/$cfg"
+          # Immutable, sha-tagged copy + a 'latest' pointer per platform/config.
+          gcloud storage cp $zip "$base/$env:PROJECT_NAME-$env:BUILD_ID.zip"
+          gcloud storage cp $zip "$base/latest.zip"
+          "$env:GITHUB_SHA" | Out-File -Encoding ascii latest.sha
+          gcloud storage cp latest.sha "$base/latest.sha"
+          Write-Host "Published $cfg $plat build -> $base/"