Storage emulator returning wrong host for upload URL's

[dermasmid]

[REQUIRED] Environment info

firebase-tools: 10.5.0

Platform: macOS

[REQUIRED] Test case

[REQUIRED] Steps to reproduce

1. create docker contianer with storage emulator in it and make it listen to "host": "0.0.0.0" (so it can be accessed from outside the container)
2. create a second container and try to upload a file to the emulator

what will happen is that it will try to connect to 0.0.0.0 and it will fail

[REQUIRED] Expected behavior

the emulator should not return the bind host, instead return the req.hostname

[REQUIRED] Actual behavior

emulator uses the bing host to determine the host

related issue: googleapis/nodejs-storage#1611

[google-oss-bot]

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