CORS issue for uploading image to Post in demo app

[klyburke]

@tima101 Noting to ourselves that in the current demo app, a user is unable to add an image to a Post due to a CORS problem.

Access to fetch at 'https://saas-api.builderbook.org/api/v1/team-member/aws/get-signed-request-for-upload-to-s3' from origin 'https://saas-app.builderbook.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

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Click to see Hill for issue #135

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created by Async

[tima101]

@klyburke Image upload works on YourSettings page, meaning it is not S3 problem and not cors Express middleware problem, must be problem in Post-related code. I will report here when I find out.

[tima101]

@klyburke Pushed fix
83fa735
f4c89cb

One of env var was not available on the browser.
Let's keep it open until I make fix in the book's content.

[tima101]

@klyburke Solved.

[klyburke]

I confirm that image upload in a Post is working now. Thanks!