docs(gcp): add credentials DX examples

[Mkassabov]

GCP SDK credentials DX: env token and explicit token, then a distilled service call. No ADC and no service-account signing — mint the bearer outside the SDK (gcloud auth print-access-token).

DX

import * as storage from "@distilled.cloud/gcp/storage_v1";
import { CredentialsFromEnv } from "@distilled.cloud/gcp/Credentials";
import * as Effect from "effect/Effect";

const object = yield* storage
  .getObjects({ bucket: "my-bucket", object: "hello.txt" })
  .pipe(Effect.provide(CredentialsFromEnv));

import * as pubsub from "@distilled.cloud/gcp/pubsub_v1";
import { fromAccessToken } from "@distilled.cloud/gcp/Credentials";
import * as Effect from "effect/Effect";

const published = yield* pubsub
  .publishProjectsTopics({
    topic: "projects/my-project/topics/events",
    body: { messages: [{ data: btoa("hello") }] },
  })
  .pipe(
    Effect.provide(
      fromAccessToken({
        accessToken: process.env.GOOGLE_ACCESS_TOKEN!,
        project: "my-project",
      }),
    ),
  );

Services stay on @distilled.cloud/gcp/<name>_<version> (storage_v1, pubsub_v1, compute_v1, …). The package root exports credentials, protocol, and errors only.

[alchemy-version-bot]

Install the packages built from this commit:

Distilled

@distilled.cloud/core

bun add https://pkg.ing/@distilled.cloud/core/cecf35f

@distilled.cloud/gcp

bun add https://pkg.ing/@distilled.cloud/gcp/cecf35f