How to fix Unable to find image locally. Error response from daemon: pull access denied for myapp, repository does not exist or may require docker login in Docker

# Format: [registry/][namespace/]repository[:tag]
# Examples:
docker pull nginx                    # Docker Hub official
docker pull myuser/myapp             # Docker Hub user repo
docker pull ghcr.io/owner/repo:v1    # GitHub Container Registry
docker pull myregistry.com/app:latest

docker search <image_name>

# Docker Hub
docker login

# Other registries
docker login ghcr.io
docker login myregistry.azurecr.io

# With username
docker login -u myusername

# Docker Hub (default, no prefix needed)
docker pull nginx

# GitHub Container Registry
docker pull ghcr.io/owner/image

# Amazon ECR
docker pull 123456789.dkr.ecr.us-east-1.amazonaws.com/myapp

# Google Container Registry
docker pull gcr.io/project-id/image

# Check remaining pulls (anonymous)
curl -s "https://auth.docker.io/token?service=registry.docker.io&scope=repository:ratelimitpreview/test:pull" | jq -r .token | cut -d. -f2 | base64 -d | jq

# Or check headers during pull
TOKEN=$(curl -s "https://auth.docker.io/token?service=registry.docker.io&scope=repository:library/nginx:pull" | jq -r .token)
curl -sI -H "Authorization: Bearer $TOKEN" https://registry-1.docker.io/v2/library/nginx/manifests/latest | grep -i ratelimit

# List local images
docker images

# Build from Dockerfile
docker build -t myapp:latest .

# Tag for a registry
docker tag myapp:latest myregistry.com/myapp:latest

services:
  app:
    # Use build if you have a Dockerfile
    build: .
    # OR use image if pulling
    image: myregistry.com/myapp:latest