feat: add support for docker images (#2714)

* feat: add support for docker images

Issue #724

A new config section under "HTTP" called "Compat" is added which
currently takes a list of possible compatible legacy media-types.

https://github.com/opencontainers/image-spec/blob/main/media-types.md#compatibility-matrix

Only "docker2s2" (Docker Manifest V2 Schema V2) is currently supported.

Garbage collection also needs to be made aware of non-OCI compatible
layer types.
feat: add cve support for non-OCI compatible layer types

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

* 

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

* test: add more docker compat tests

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

* feat: add additional validation checks for non-OCI images

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

* ci: make "full" images docker-compatible

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

---------

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

pkg/api/config/config.go

@@ -7,6 +7,7 @@ import (
 
 	distspec "github.com/opencontainers/distribution-spec/specs-go"
 
+	"zotregistry.dev/zot/pkg/compat"
 	extconf "zotregistry.dev/zot/pkg/extensions/config"
 	storageConstants "zotregistry.dev/zot/pkg/storage/constants"
 )
@@ -122,7 +123,8 @@ type HTTPConfig struct {
 	Auth          *AuthConfig
 	AccessControl *AccessControlConfig `mapstructure:"accessControl,omitempty"`
 	Realm         string
-	Ratelimit     *RatelimitConfig `mapstructure:",omitempty"`
+	Ratelimit     *RatelimitConfig            `mapstructure:",omitempty"`
+	Compat        []compat.MediaCompatibility `mapstructure:",omitempty"`
 }
 
 type SchedulerConfig struct {