fix github release creation

[chipitsine]

Are you using SoftEther VPN 5.x?

• Yes, I'm using SoftEther VPN 5.x, not 4.x.

Version

master

Component

Other

Operating system & version

independent

Architecture or Hardware model

amd64

Steps to reproduce

when github release is created, the archive without git submodules is uploaded to github releases. we need to modify either appropriate workflow or some github setting to add submodules as well

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

Anything else?

No response

[chipitsine]

sorry, we are not interested in hidden files. we are interested in git submodules (which can be checked out using --recursive and usually not included to "git release" command)

@copilot ?