Request builder: Allow the use of insecure TLS ciphers when Allow self-signed or invalid certificates is used

Some server on the wild are badly configured. Either by mistake or lack
of maintenance. Safe and unsafe Ciphers change overtime based on new
discoveries.

This proposition will include considered unsafe ciphers when `Allow self-signed or invalid certificates` is used.
It could be put into a separate option but, I felt this could fit in.

fix #2671

internal/reader/fetcher/request_builder.go

@@ -109,6 +109,16 @@ func (r *RequestBuilder) IgnoreTLSErrors(value bool) *RequestBuilder {
 }
 
 func (r *RequestBuilder) ExecuteRequest(requestURL string) (*http.Response, error) {
+	// We get the safe ciphers
+	ciphers := tls.CipherSuites()
+	if r.ignoreTLSErrors {
+		// and the insecure ones if we are ignoring TLS errors. This allows to connect to badly configured servers anyway
+		ciphers = append(ciphers, tls.InsecureCipherSuites()...)
+	}
+	cipherSuites := []uint16{}
+	for _, cipher := range ciphers {
+		cipherSuites = append(cipherSuites, cipher.ID)
+	}
 	transport := &http.Transport{
 		Proxy: http.ProxyFromEnvironment,
 		// Setting `DialContext` disables HTTP/2, this option forces the transport to try HTTP/2 regardless.
@@ -128,6 +138,7 @@ func (r *RequestBuilder) ExecuteRequest(requestURL string) (*http.Response, erro
 		IdleConnTimeout: 10 * time.Second,
 
 		TLSClientConfig: &tls.Config{
+			CipherSuites:       cipherSuites,
 			InsecureSkipVerify: r.ignoreTLSErrors,
 		},
 	}