gcloud app create --project $projectID

Please choose the region where you want your App Engine application
located:

 [1] asia-east2    (supports standard and flexible and search_api)
 [2] asia-northeast1 (supports standard and flexible and search_api)
 [3] asia-northeast2 (supports standard and flexible and search_api)

・・・

package main

import (
    "fmt"
    "net/http"
)

func main() {

    http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
        fmt.Fprintf(writer, "Hello! GAE")
    })

    http.ListenAndServe(":8080", nil)
}

runtime: go115  # or another supported version

instance_class: F2

handlers:
  - url: /.*
    script: auto

name: ci
on: push

jobs:
  deplay-staging:
    name: GAE deplay
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - name: Deploy an App Engine app
        id: deploy-app
        uses: google-github-actions/[email protected]
        with:
          project_id: ${{ secrets.GCP_PROJECT_ID }}
          deliverables: app.yaml
          credentials: ${{ secrets.GCP_SA_KEY }}
          version: v1

deliverables: app.yaml index.yaml

App Engine デプロイ担当者
Cloud Build サービス アカウント
Cloud Datastore インデックス管理者
サービス アカウント ユーザー
Storage オブジェクト作成者
Storage オブジェクト閲覧者

ERROR: (gcloud.app.deploy) User [githubactions@***.iam.gserviceaccount.com] does not have permission to access apps instance [***] (or it may not exist): App Engine Admin API has not been used in project 960294636917 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/appengine.googleapis.com/overview?project=960294636917 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.
- '@type': type.googleapis.com/google.rpc.Help
  links:
  - description: Google developers console API activation
    url: https://console.developers.google.com/apis/api/appengine.googleapis.com/overview?project=960294636917
- '@type': type.googleapis.com/google.rpc.ErrorInfo
  domain: googleapis.com
  metadata:
    consumer: projects/960294636917
    service: appengine.googleapis.com
  reason: SERVICE_DISABLED
Error: The process '/opt/hostedtoolcache/gcloud/334.0.0/x64/bin/gcloud' failed with exit code 1

ERROR: (gcloud.app.deploy) Permissions error fetching application [apps/***]. Please make sure that you have permission to view applications on the project and that githubactions@***.iam.gserviceaccount.com has the App Engine Deployer (roles/appengine.deployer) role.
Error: The process '/opt/hostedtoolcache/gcloud/334.0.0/x64/bin/gcloud' failed with exit code 1

ERROR: (gcloud.app.deploy) 403 Could not list bucket [staging.***.appspot.com]: githubactions@***.iam.gserviceaccount.com does not have storage.objects.list access to the Google Cloud Storage bucket.

MaxRetrialsException: last_result=(None, (<class 'googlecloudsdk.api_lib.storage.storage_api.UploadError'>, UploadError('403 Could not upload file [/tmp/tmp2v7gw5h5/tmptdnalnkg/app.yaml] to [staging.***.appspot.com/f9c11cf55f7591fe608003007aaae9b371eeaf3c]: githubactions@***.iam.gserviceaccount.com does not have storage.objects.create access to the Google Cloud Storage object.'), <traceback object at 0x7f80a8176100>)), last_retrial=3, time_passed_ms=476,time_to_wait=0

ERROR: (gcloud.app.deploy) PERMISSION_DENIED: You do not have permission to act as '***@appspot.gserviceaccount.com'

ERROR: (gcloud.app.deploy) Error Response: [7] Failed to create cloud build: Permission denied.

ERROR: (gcloud.app.deploy) User [〇〇] does not have permission to access projects instance [***] (or it may not exist): The caller does not have permission