initial

.github/workflows/mobile-build.yml

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+# Mobile build placeholder.
+# Wire up EAS Build (https://docs.expo.dev/eas/) once credentials + a project id exist.
+# Typical setup:
+#   - EAS_PROJECT_ID + EXPO_TOKEN as repo secrets
+#   - `eas build --platform all --non-interactive` on tag push
+name: Mobile Build
+
+on:
+  workflow_dispatch:
+
+jobs:
+  placeholder:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Wire up EAS Build when ready."