Add deploy step

.build.yml

@@ -15,3 +15,13 @@ tasks:
   - test: |
       cd wish
       mix test
+  - deploy: |
+      if [ $GIT_REF = "main" ]; then
+        curl -L https://fly.io/install.sh | sh
+        export FLYCTL_INSTALL="/root/.fly"
+        export PATH="$FLYCTL_INSTALL/bin:$PATH"
+        cd wish
+        fly deploy
+      else
+        echo "nothing to do"
+      fi