SDK doesn't honor FIREBASE_STORAGE_EMULATOR_HOST environment variable

[abhis3]

Go Version: 1.19.2
Emulator Version: 11.16.0

Describe the problem

The GO Admin SDK doesn't honor the env var set through FIREBASE_STORAGE_EMULATOR_HOST. You can see in this code sample that we need to set STORAGE_EMULATOR_HOST as well for this to work, or else the code will still try and point to prod.

You can see that there is some logic in the Node Admin SDK to handle this case: https://github.com/firebase/firebase-admin-node/blob/f596f2ca0d624990b93c1164a83b056ac064d38d/src/storage/storage.ts#L48

Other users are running into this issue, see https://stackoverflow.com/questions/71561446/firebase-storage-emulator-ignored-by-go-admin-sdk

Relevant Code:

https://github.com/abhis3/firebase-go-admin-sdk-mvp/blob/main/hello.go#L35

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[abhis3]

Needs to be labeled with api:storage

[lahirumaramba]

Hi @abhis3 ! Thank you so much for reporting this issue. You are right, we need to map the firebase style env var to the cloud style env var. We can follow the same logic we used in the Node.js repo firebase/firebase-admin-node#1175

FYI: @christhompsongoogle