Default predeploy commands in firebase.app.json do not work in CI environments

[simondotm]

    "predeploy": [
      "nx build app-functions --with-deps",
      "nx lint app-functions"
    ],

Gives nx: not found error in Github CI action. Presumably because CI environment doesnt have nx cli globally installed.

Should likely be:

    "predeploy": [
      "npx nx build app-functions --with-deps",
      "npx nx lint app-functions"
    ],