Update moonbeam.yml

.github/workflows/moonbeam.yml

@@ -1 +1,33 @@
 # placeholder to be able to trigger the new workflow
+name: Manual Build - Moonbeam
+
+env:
+  SUBWASM_VERSION: 0.20.0
+  RUST_LOG: subwasm=debug
+
+on:
+  workflow_dispatch:
+    inputs:
+      srtool_tag:
+        description: The SRTOOL tag to use
+        default: 1.70.0
+        required: false
+      ref:
+        description: The ref to be used for the repo
+        default: master
+        required: false
+
+jobs:
+  build:
+    name: Build ${{ matrix.chain }} ${{ github.event.inputs.ref }}
+    strategy:
+      matrix:
+        chain: ["moonriver"]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          repository: PureStake/moonbeam
+          ref: ${{ github.event.inputs.ref }}
+          fetch-depth: 0