fix(git)!: use internal proxy for all git operations (#39426)

Introduces gitproxy module which spawns a small forward proxy as scanner
for git calls
Replaces hostmatcher with matchlist which supports port rules
Deprecates ALLOWED_DOMAINS/BLOCKED_DOMAINS and ALLOW_LOCALNETWORKS
settings in migration in favor of full names we have in security
configs.
Removes `external` preset in favor of lax/strict modes, strict mode
requiring explicit ports if they aren't standard http/s ones.

Breaking changes:
- `external` preset no longer works as deny rule. To enforce that, use
`strict` mode and allow ranges to connect to
- Wildcards are no longer accepted in IP addresses
- `*` is no longer allowed as entry in lists
- domain rules now use curl like syntax `*.example.com` matching
subdomains but not `example.com`, `example.com` matching itself and all
subdomains. `example.*` is not a valid rule
- In the default `lax` mode, `[security] ALLOWED_HOST_LIST` no longer
restricts public hosts, set `EGRESS_MODE = strict` to keep an exclusive
list. A startup warning flags this
- Invalid list entries are logged at startup, invalid
`BLOCKED_HOST_LIST`/`BLOCKED_DOMAINS` entries stop it

Docs: https://gitea.com/gitea/docs/pulls/557
Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: bircni <bircni@icloud.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/webhook/main_test.go

@@ -7,7 +7,6 @@ import (
 	"testing"
 
 	"gitea.dev/models/unittest"
-	"gitea.dev/modules/hostmatcher"
 	"gitea.dev/modules/setting"
 
 	_ "gitea.dev/models"
@@ -17,9 +16,7 @@ import (
 func TestMain(m *testing.M) {
 	unittest.MainTest(m, &unittest.TestOptions{
 		SetUp: func() error {
-			// for tests, allow only loopback IPs. This must run after the test config is loaded (which
-			// resets the shared Security.AllowedHostList) and before Init() builds the delivery client.
-			setting.Security.AllowedHostList = hostmatcher.MatchBuiltinLoopback
+			setting.Webhook.AllowedHostList = "loopback:*"
 			setting.LoadQueueSettings()
 			return Init()
 		},