Install flyctl first, refs #45

Author: simonw

.github/workflows/push.yml

@@ -48,6 +48,9 @@ jobs:
       run: |-
         wget https://niche-museums.fly.dev/browse.db
         ./build.sh
+    - name: Install Fly
+      run: |
+        curl -L https://fly.io/install.sh | sh
     - name: Deploy to Fly
       env:
         FLY_API_TOKEN: ${{ secrets.FLY_TOKEN }}