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>

modules/git/repo.go

@@ -7,7 +7,6 @@ package git
 import (
 	"context"
 	"fmt"
-	"net/url"
 	"os"
 	"path"
 	"path/filepath"
@@ -19,7 +18,6 @@ import (
 	"gitea.dev/modules/cache"
 	"gitea.dev/modules/git/gitcmd"
 	"gitea.dev/modules/git/gitrepo"
-	"gitea.dev/modules/proxy"
 	"gitea.dev/modules/setting"
 	"gitea.dev/modules/util"
 )
@@ -183,7 +181,6 @@ func Clone(ctx context.Context, from, to string, opts CloneRepoOptions) error {
 	}
 
 	cmd := gitcmd.NewCommand().AddArguments("clone")
-	HandleGitCmdHTTPRedirection(cmd, from, to)
 	if opts.SkipTLSVerify {
 		cmd.AddArguments("-c", "http.sslVerify=false")
 	}
@@ -220,20 +217,7 @@ func Clone(ctx context.Context, from, to string, opts CloneRepoOptions) error {
 		opts.Timeout = -1
 	}
 
-	envs := os.Environ()
-	if opts.Env != nil {
-		envs = opts.Env
-	} else {
-		u, err := url.Parse(from)
-		if err == nil {
-			envs = proxy.EnvWithProxy(u)
-		}
-	}
-
-	return cmd.
-		WithTimeout(opts.Timeout).
-		WithEnv(envs).
-		RunWithStderr(ctx)
+	return cmd.WithTimeout(opts.Timeout).WithEnv(opts.Env).RunWithStderr(ctx)
 }
 
 // PushOptions options when push to remote