Add Debian package registry (#24426)

Co-authored-by: @awkwardbunny

This PR adds a Debian package registry.
You can follow [this
tutorial](https://www.baeldung.com/linux/create-debian-package) to build
a *.deb package for testing.
Source packages are not supported at the moment and I did not find
documentation of the architecture "all" and how these packages should be
treated.


![grafik](https://user-images.githubusercontent.com/1666336/218126879-eb80a866-775c-4c8e-8529-5797203a64e6.png)

Part of #20751.

Revised copy of #22854.

---------

Co-authored-by: Brian Hong <brian@hongs.me>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Giteabot <teabot@gitea.io>

modules/packages/hashed_buffer.go

@@ -25,8 +25,15 @@ type HashedBuffer struct {
 	combinedWriter io.Writer
 }
 
-// NewHashedBuffer creates a hashed buffer with a specific maximum memory size
-func NewHashedBuffer(maxMemorySize int) (*HashedBuffer, error) {
+const DefaultMemorySize = 32 * 1024 * 1024
+
+// NewHashedBuffer creates a hashed buffer with the default memory size
+func NewHashedBuffer() (*HashedBuffer, error) {
+	return NewHashedBufferWithSize(DefaultMemorySize)
+}
+
+// NewHashedBuffer creates a hashed buffer with a specific memory size
+func NewHashedBufferWithSize(maxMemorySize int) (*HashedBuffer, error) {
 	b, err := filebuffer.New(maxMemorySize)
 	if err != nil {
 		return nil, err
@@ -43,9 +50,14 @@ func NewHashedBuffer(maxMemorySize int) (*HashedBuffer, error) {
 	}, nil
 }
 
-// CreateHashedBufferFromReader creates a hashed buffer and copies the provided reader data into it.
-func CreateHashedBufferFromReader(r io.Reader, maxMemorySize int) (*HashedBuffer, error) {
-	b, err := NewHashedBuffer(maxMemorySize)
+// CreateHashedBufferFromReader creates a hashed buffer with the default memory size and copies the provided reader data into it.
+func CreateHashedBufferFromReader(r io.Reader) (*HashedBuffer, error) {
+	return CreateHashedBufferFromReaderWithSize(r, DefaultMemorySize)
+}
+
+// CreateHashedBufferFromReaderWithSize creates a hashed buffer and copies the provided reader data into it.
+func CreateHashedBufferFromReaderWithSize(r io.Reader, maxMemorySize int) (*HashedBuffer, error) {
+	b, err := NewHashedBufferWithSize(maxMemorySize)
 	if err != nil {
 		return nil, err
 	}