restore fly workflow

.github/workflows/fly-deploy.yml

@@ -0,0 +1,31 @@
+name: Deploy to Fly
+
+on:
+  workflow_run:
+      workflows: ["Publish Docker Image"]
+      branches: [production]
+      types: 
+        - completed
+  workflow_dispatch:
+    inputs:
+        imageTag:
+          description: 'Docker Image Tag'
+          required: true
+          type: string
+          default: 'latest'
+
+env:
+  FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 
+        uses: actions/checkout@v2
+
+      - name: Setup Fly
+        uses: superfly/flyctl-actions/setup-flyctl@master
+      
+      - name: Deploy
+        run: flyctl deploy