🔧 Add main-staging workflow

.github/workflows/build-main-staging.yml

@@ -0,0 +1,22 @@
+name: _MAIN-STAGING
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '26 5-20 * * 1-5'
+
+jobs:
+  build-bundle:
+    uses: ./.github/workflows/build-bundle.yml
+    secrets: inherit
+    with:
+      gh_ref: "main-staging"
+      build_wasm: "yes"
+      build_storybook: "yes"
+
+  build-docker:
+    needs: build-bundle
+    uses: ./.github/workflows/build-docker.yml
+    secrets: inherit
+    with:
+      gh_ref: "main-staging"