How can I release my api for anyone to consume?

I have a server made in go, gin and libpq, my front end is trying to consume the api but it is giving an error..
this error:

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<!-- language: lang-html -->

Access to fetch at 'https://--brapoio-t.azurewebsites.net/-/-o' from origin 'https://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

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(the url was changed on purpose to ask the question here on stack overflow)

My project is divided like this:

main.go
routes:
//routes

main.go:

package main

import (
"os"

"github.com/gin-gonic/gin"
"github.com/guilherm5/brapoio/routes"

)

func main() {

Router := gin.New()
Router.Use(gin.LoggerWithWriter(gin.DefaultErrorWriter))

//tem toda minha parte de configuração
routes.ConfiguracaoSistema(Router)
routes.ConfiguracaoModulo(Router)
routes.ModuloSistema(Router)
routes.ArvoreMenu(Router)
routes.ModuloArvoreMenu(Router)

//tem toda minha parte de Usuario
routes.Usuario(Router)
routes.EmpresaUsuario(Router)
routes.CampoTabelaUsuario(Router)
routes.ProgramaUsuario(Router)
routes.FuncionalidadeProgramaUsuario(Router)
routes.TabelaUsuario(Router)
routes.ParametroFiltroTabelaUsuario(Router)
//meu servidor de autenticação
routes.JWTAutentication(Router)

listenAddr := ":1000"

if val, ok := os.LookupEnv("FUNCTIONS_CUSTOMHANDLER_PORT"); ok {
	listenAddr = ":" + val
}

Router.Run(listenAddr)

}

an example of package routes:

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

package routes

import (
	"github.com/gin-gonic/gin"
	"github.com/guilherm5/brapoio/controllers"
)

//NAO ESQUECER DE FAZER AZURE

func ModuloSistema(c *gin.Engine) {
	c.GET("/api/moduloSistema", controllers.GetModuloSistema())
	c.GET("/api/moduloSistemaID", controllers.GetModuloSistemaID())
	c.POST("/api/moduloSistema", controllers.NewModuloSistema())
	c.PUT("/api/moduloSistema", controllers.UpdateModuloSistemao())
	c.DELETE("/api/moduloSistema", controllers.DeleteModuloSistema())
}

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How can I solve this error that my front end has been getting?

I think first you should read about CORS to understand why it blocks your Frontend site to access the resources. You can read this doc from Mozilla for more detail. For your case with Gin, you can add CORS middleware to enable it.