Add the ability to inject env variables through .env file creation

[arkadiuszbachorski]

Add the ability to inject env variables through .env file creation

♻️ Current situation & Problem

#82 aims to achieve the same effect. We need to do it through .env file creation, because otherwise values aren't properly propagated to build process.

⚙️ Release Notes

• Add the ability to inject env variables through .env file creation

✅ Testing

I updated created test deployment of Web-Frontend successfully with this branch.

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[PSchmiedmayer]

Thank you @arkadiuszbachorski!