Program.cs

using CrudApi.DataContext;
using CrudApi.Service.EmployeesService;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

DotNetEnv.Env.Load();

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddScoped<IEmployeeInterface, EmployeeService>();
builder.Services.AddDbContext<ApplicationDbContext>(options =>
{
    //options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection"));
    var connectionString = Environment.GetEnvironmentVariable("DB_CONNECTION_STRING");
    options.UseSqlServer(connectionString);
});

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();