Cannot connect my application to sql server on docker.

version: '3.4'

name: fitness

services:
  api:
    container_name: api
    build:
      context: .
      dockerfile: API/Dockerfile
    ports:
      - "5000:8080"
    depends_on:
      - docker_sqlserver

  docker_sqlserver:
    container_name: docker_sqlserver
    build:
      context: .
      dockerfile: API/db.Dockerfile
    ports:
      - "1433:1433"

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
WORKDIR /App

COPY API/API.csproj ./API/

RUN dotnet restore API/API.csproj

COPY API/ ./API/

RUN dotnet publish API/API.csproj -c Release -o out

FROM mcr.microsoft.com/dotnet/aspnet:8.0

WORKDIR /App
EXPOSE 8080
COPY --from=build-env /App/out ./
ENTRYPOINT ["dotnet", "API.dll"]

FROM mcr.microsoft.com/mssql/server:latest AS sqlserver
ENV ACCEPT_EULA=Y
ENV SA_PASSWORD=myPassword1!

ENV MSSQL_DBNAME=FitnessApp