Flogo Web UI doesn't create an executable binary on macOS

[retgits]

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[] feature request
[] support request
[] general question

Current behavior (how does the issue manifest): When you build your app using the Flogo Web UI, the app misses the execution bit and can only be run after executing chmod +x <app>

Expected behavior: After the binary is finished downloading I want to run my app without requiring extra steps

Minimal steps to reproduce the problem (not required if feature enhancement):

• Build an app using the Web UI
• run ./<app>

Please tell us about your environment (Operating system, docker version, browser & web ui version, etc): Flogo Web UI 0.5.4

Flogo version (CLI & contrib/lib. If unknown, leave empty or state unknown):

flogo cli version [v0.5.5]

Additional information you deem important (e.g. issue happens only occasionally):

[fcastill]

I don't think we can keep the executable permissions unless we tar/zip the binary before triggering the download.