Erro de conexão bd

Pessoal,

Estou tendo problema ao tentar acessar o banco de dados. O primeiro teste de conexão funcionou, mas o tentar exibir os dados, da o seguinte erro no console.

2021/12/01 01:30:07 http: panic serving [::1]:54916: dial tcp 127.0.0.1:5432: connect: connection refused
goroutine 34 [running]:
net/http.(*conn).serve.func1(0xc000156000)
        /usr/lib/go-1.13/src/net/http/server.go:1767 +0x139
panic(0x7ad680, 0xc000134270)
        /usr/lib/go-1.13/src/runtime/panic.go:679 +0x1b2
main.index(0x8d2520, 0xc0001320e0, 0xc000176000)
        /mnt/c/Users/Evandro/Documents/workspace/golang/appweb/main.go:41 +0x585
net/http.HandlerFunc.ServeHTTP(0x85eaa0, 0x8d2520, 0xc0001320e0, 0xc000176000)
        /usr/lib/go-1.13/src/net/http/server.go:2007 +0x44
net/http.(*ServeMux).ServeHTTP(0xb5f520, 0x8d2520, 0xc0001320e0, 0xc000176000)
        /usr/lib/go-1.13/src/net/http/server.go:2387 +0x1bd
net/http.serverHandler.ServeHTTP(0xc000132000, 0x8d2520, 0xc0001320e0, 0xc000176000)
        /usr/lib/go-1.13/src/net/http/server.go:2802 +0xa4
net/http.(*conn).serve(0xc000156000, 0x8d30e0, 0xc00012c080)
        /usr/lib/go-1.13/src/net/http/server.go:1890 +0x875
created by net/http.(*Server).Serve
        /usr/lib/go-1.13/src/net/http/server.go:2928 +0x384
2021/12/01 01:30:07 http: panic serving [::1]:54918: dial tcp 127.0.0.1:5432: connect: connection refused
goroutine 35 [running]:
net/http.(*conn).serve.func1(0xc0001560a0)
        /usr/lib/go-1.13/src/net/http/server.go:1767 +0x139
panic(0x7ad680, 0xc0000120a0)
        /usr/lib/go-1.13/src/runtime/panic.go:679 +0x1b2
main.index(0x8d2520, 0xc0001e4000, 0xc000176100)
        /mnt/c/Users/Evandro/Documents/workspace/golang/appweb/main.go:41 +0x585
net/http.HandlerFunc.ServeHTTP(0x85eaa0, 0x8d2520, 0xc0001e4000, 0xc000176100)
        /usr/lib/go-1.13/src/net/http/server.go:2007 +0x44
net/http.(*ServeMux).ServeHTTP(0xb5f520, 0x8d2520, 0xc0001e4000, 0xc000176100)
        /usr/lib/go-1.13/src/net/http/server.go:2387 +0x1bd
net/http.serverHandler.ServeHTTP(0xc000132000, 0x8d2520, 0xc0001e4000, 0xc000176100)
        /usr/lib/go-1.13/src/net/http/server.go:2802 +0xa4
net/http.(*conn).serve(0xc0001560a0, 0x8d30e0, 0xc00012c140)
        /usr/lib/go-1.13/src/net/http/server.go:1890 +0x875
created by net/http.(*Server).Serve
        /usr/lib/go-1.13/src/net/http/server.go:2928 +0x384
2021/12/01 01:30:07 http: panic serving [::1]:54924: dial tcp 127.0.0.1:5432: connect: connection refused
goroutine 9 [running]:
net/http.(*conn).serve.func1(0xc000216000)
        /usr/lib/go-1.13/src/net/http/server.go:1767 +0x139
panic(0x7ad680, 0xc000012140)
        /usr/lib/go-1.13/src/runtime/panic.go:679 +0x1b2
main.index(0x8d2520, 0xc0001e40e0, 0xc0001fe100)
        /mnt/c/Users/Evandro/Documents/workspace/golang/appweb/main.go:41 +0x585
net/http.HandlerFunc.ServeHTTP(0x85eaa0, 0x8d2520, 0xc0001e40e0, 0xc0001fe100)
        /usr/lib/go-1.13/src/net/http/server.go:2007 +0x44
net/http.(*ServeMux).ServeHTTP(0xb5f520, 0x8d2520, 0xc0001e40e0, 0xc0001fe100)
        /usr/lib/go-1.13/src/net/http/server.go:2387 +0x1bd
net/http.serverHandler.ServeHTTP(0xc000132000, 0x8d2520, 0xc0001e40e0, 0xc0001fe100)
        /usr/lib/go-1.13/src/net/http/server.go:2802 +0xa4
net/http.(*conn).serve(0xc000216000, 0x8d30e0, 0xc00002e240)
        /usr/lib/go-1.13/src/net/http/server.go:1890 +0x875
created by net/http.(*Server).Serve
        /usr/lib/go-1.13/src/net/http/server.go:2928 +0x384

Segue meu código.

package main

import (
    "database/sql"
    "net/http"
    "text/template"

    _ "github.com/lib/pq"
)

func conectaComBancoDeDados() *sql.DB {
    conexao := "user=postgres dbname=appweb password=123456 host=localhost sslmode=disable"
    db, err := sql.Open("postgres", conexao)
    if err != nil {
        panic(err.Error())
    }
    return db
}

type Produto struct {
    Id         int
    Nome       string
    Descricao  string
    Preco      float64
    Quantidade int
}

var temp = template.Must(template.ParseGlob("templates/*.html"))

func main() {

    http.HandleFunc("/", index)
    http.ListenAndServe(":8000", nil)
}

func index(w http.ResponseWriter, r *http.Request) {
    db := conectaComBancoDeDados()

    selectDeTodosOsProdutos, err := db.Query("select * from produtos")
    if err != nil {
        panic(err.Error())
    }

    p := Produto{}
    produtos := []Produto{}

    for selectDeTodosOsProdutos.Next() {
        var id, quantidade int
        var nome, descricao string
        var preco float64

        err = selectDeTodosOsProdutos.Scan(&id, &nome, &descricao, &preco, &quantidade)
        if err != nil {
            panic(err.Error())
        }