Add DNS provider for Beget.com

[cfif-31]

Beget is an accredited domain name registrar. It is a large registrar of RU/РФ domains. I am a client of this registrar. Also, this registrar provides DNS for the domain.

The API allows you to work with DNS records, including TXT, required for verification.

This PR adds support for this registrar to such an extremely useful thing as Lego

[ldez]

Hello, in order for a PR adding a DNS provider to be accepted, you have to:

• add a description to your PR
• be able to maintain this provider
• have a homogeneous design with the other providers
• add tests (units)

make test

• add tests ("live")
  

  lego/providers/dns/cloudflare/cloudflare_test.go

  Lines 125 to 151 in c938de6

  	func TestLivePresent(t *testing.T) {
  	if !envTest.IsLiveTest() {
  	t.Skip("skipping live test")
  	}
  	envTest.RestoreEnv()
  	provider, err := NewDNSProvider()
  	require.NoError(t, err)
  	err = provider.Present(envTest.GetDomain(), "", "123d==")
  	require.NoError(t, err)
  	}
  	func TestLiveCleanUp(t *testing.T) {
  	if !envTest.IsLiveTest() {
  	t.Skip("skipping live test")
  	}
  	envTest.RestoreEnv()
  	provider, err := NewDNSProvider()
  	require.NoError(t, err)
  	time.Sleep(2 * time.Second)
  	err = provider.CleanUp(envTest.GetDomain(), "", "123d==")
  	require.NoError(t, err)
  	}

make test

• add a provider descriptor
• generate CLI help, documentation, and readme.

make generate-dns

• be able to do: (and put the output of this command to a comment in your PR)

rm -rf .lego

./lego -m your@email.com --dns YOUR_PROVIDER_NAME -d *.example.com -d example.com -s https://acme-staging-v02.api.letsencrypt.org/directory run

Note the wildcard domain is important.

• pass the linter (golangci-lint must be installed):

make checks

• do go mod tidy

[ldez]

ping @cfif-31

[ldez]

ping @cfif-31

[ldez]

@cfif-31 can you provide the missing information?
#1879 (comment)

[ldez]

@cfif-31 if you don't answer I will be forced to close your PR.

[ldez]

ping @cfif-31

[ldez]

I'm still waiting for feedback @cfif-31 .

---

If there is a user that wants to test this PR, you are welcome.