Add manual workflow for updating "latest" on npm

Signed-off-by: Andrew Richardson <[email protected]>

Author: awrichar

.github/workflows/setlatest.yml

@@ -0,0 +1,21 @@
+name: npm Set Latest
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version'
+        required: true
+        type: string
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '16.x'
+          registry-url: 'https://registry.npmjs.org'
+      - run: npm dist-tag add @hyperledger/firefly-sdk@${{ inputs.version }} latest
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}