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Support setting Firebase private key only at runtime

See original GitHub issue

Describe the bug I’m using a Docker image to deploy my nextjs app however when I run yarn build it seems to expect the private key. This doesn’t make sense for my scenario. The Firebase private key will be supplied at runtime as environment variable so it shouldn’t be needed during yarn build.

See logs:

Step #0: [91m
Step #0: > Build error occurred
Step #0: [0m[91mFirebaseAppError: Service account object must contain a string "private_key" property.
Step #0:     at FirebaseAppError.FirebaseError [as constructor] (/build/node_modules/firebase-admin/lib/utils/error.js:44:28)
Step #0:     at FirebaseAppError.PrefixedFirebaseError [as constructor] (/build/node_modules/firebase-admin/lib/utils/error.js:90:28)
Step #0:     at new FirebaseAppError (/build/node_modules/firebase-admin/lib/utils/error.js:125:28)
Step #0:     at new ServiceAccount (/build/node_modules/firebase-admin/lib/credential/credential-internal.js:134:19)
Step #0:     at new ServiceAccountCredential (/build/node_modules/firebase-admin/lib/credential/credential-internal.js:68:15)
Step #0:     at Object.exports.cert (/build/node_modules/firebase-admin/lib/credential/credential.js:34:54)
Step #0:     at /build/node_modules/next-firebase-auth/build/index.node.js:2:16259
Step #0:     at init (/build/node_modules/next-firebase-auth/build/index.node.js:2:16290)
Step #0:     at initAuth (/build/.next/server/pages/_app.js:2976:66)
Step #0:     at Module.1TCz (/build/.next/server/pages/_app.js:416:36)
Step #0:     at __webpack_require__ (/build/.next/server/pages/_app.js:23:31)
Step #0:     at Object.0 (/build/.next/server/pages/_app.js:116:18)
Step #0:     at __webpack_require__ (/build/.next/server/pages/_app.js:23:31)
Step #0:     at /build/.next/server/pages/_app.js:91:18
Step #0:     at Object.<anonymous> (/build/.next/server/pages/_app.js:94:10)
Step #0:     at Module._compile (node:internal/modules/cjs/loader:1108:14) {
Step #0:   errorInfo: {
Step #0:     code: 'app/invalid-credential',
Step #0:     message: 'Service account object must contain a string "private_key" property.'
Step #0:   },
Step #0:   codePrefix: 'app'
Step #0: }
Step #0: [0m[91merror Command failed with exit code 1.
Step #0: [0minfo Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Step #0: The command '/bin/sh -c export COOKIE_SECRET_CURRENT=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1) &&     export COOKIE_SECRET_PREVIOUS=$COOKIE_SECRET_CURRENT &&     yarn build &&     rm -rf .next/cache' returned a non-zero code: 1

Version Latest, ^0.12.0

Expected result: Ability to run yarn build without having to set the private key

I followed the example application.