feat(oci): support specifying the manifest digest when pushing it

See opencontainers/distribution-spec#494 and related work

Signed-off-by: Andrei Aaron <[email protected]>

pkg/api/controller_test.go

@@ -11198,13 +11198,7 @@ func TestSupportedDigestAlgorithms(t *testing.T) {
 
  client := resty.New()
 
- // The server picks canonical digests when tags are pushed
- // See https:/opencontainers/distribution-spec/issues/494
- // It would be nice to be able to push tags with other digest algorithms and verify those are returned
- // but there is no way to specify a client preference
- // so all we can do is verify the correct algorithm is returned
-
- expectedDigestStr := image.DigestForAlgorithm(godigest.Canonical).String()
+ expectedDigestStr := image.DigestForAlgorithm(godigest.SHA512).String()
 
  verifyReturnedManifestDigest(t, client, baseURL, name, tag, expectedDigestStr)
  verifyReturnedManifestDigest(t, client, baseURL, name, expectedDigestStr, expectedDigestStr)
@@ -11238,13 +11232,7 @@ func TestSupportedDigestAlgorithms(t *testing.T) {
 
  client := resty.New()
 
- // The server picks canonical digests when tags are pushed
- // See https:/opencontainers/distribution-spec/issues/494
- // It would be nice to be able to push tags with other digest algorithms and verify those are returned
- // but there is no way to specify a client preference
- // so all we can do is verify the correct algorithm is returned
-
- expectedDigestStr := image.DigestForAlgorithm(godigest.Canonical).String()
+ expectedDigestStr := image.DigestForAlgorithm(godigest.SHA384).String()
 
  verifyReturnedManifestDigest(t, client, baseURL, name, tag, expectedDigestStr)
  verifyReturnedManifestDigest(t, client, baseURL, name, expectedDigestStr, expectedDigestStr)
@@ -11266,18 +11254,10 @@ func TestSupportedDigestAlgorithms(t *testing.T) {
 
  client := resty.New()
 
- // The server picks canonical digests when tags are pushed
- // See https:/opencontainers/distribution-spec/issues/494
- // It would be nice to be able to push tags with other digest algorithms and verify those are returned
- // but there is no way to specify a client preference
- // so all we can do is verify the correct algorithm is returned
- expectedDigestStr := multiarch.DigestForAlgorithm(godigest.Canonical).String()
+ expectedDigestStr := multiarch.DigestForAlgorithm(godigest.SHA512).String()
 
  verifyReturnedManifestDigest(t, client, baseURL, name, tag, expectedDigestStr)
  verifyReturnedManifestDigest(t, client, baseURL, name, expectedDigestStr, expectedDigestStr)
-
- // While the expected multiarch manifest digest is always using the canonical algorithm
- // the sub-imgage manifest digest can use any algorith
  verifyReturnedManifestDigest(t, client, baseURL, name,
  subImage1.ManifestDescriptor.Digest.String(), subImage1.ManifestDescriptor.Digest.String())
  verifyReturnedManifestDigest(t, client, baseURL, name,
@@ -11303,9 +11283,6 @@ func TestSupportedDigestAlgorithms(t *testing.T) {
 
  expectedDigestStr := multiarch.DigestForAlgorithm(godigest.SHA512).String()
  verifyReturnedManifestDigest(t, client, baseURL, name, expectedDigestStr, expectedDigestStr)
-
- // While the expected multiarch manifest digest is always using the canonical algorithm
- // the sub-imgage manifest digest can use any algorith
  verifyReturnedManifestDigest(t, client, baseURL, name,
  subImage1.ManifestDescriptor.Digest.String(), subImage1.ManifestDescriptor.Digest.String())
  verifyReturnedManifestDigest(t, client, baseURL, name,
@@ -11328,18 +11305,10 @@ func TestSupportedDigestAlgorithms(t *testing.T) {
 
  client := resty.New()
 
- // The server picks canonical digests when tags are pushed
- // See https:/opencontainers/distribution-spec/issues/494
- // It would be nice to be able to push tags with other digest algorithms and verify those are returned
- // but there is no way to specify a client preference
- // so all we can do is verify the correct algorithm is returned
- expectedDigestStr := multiarch.DigestForAlgorithm(godigest.Canonical).String()
+ expectedDigestStr := multiarch.DigestForAlgorithm(godigest.SHA384).String()
 
  verifyReturnedManifestDigest(t, client, baseURL, name, tag, expectedDigestStr)
  verifyReturnedManifestDigest(t, client, baseURL, name, expectedDigestStr, expectedDigestStr)
-
- // While the expected multiarch manifest digest is always using the canonical algorithm
- // the sub-imgage manifest digest can use any algorith
  verifyReturnedManifestDigest(t, client, baseURL, name,
  subImage1.ManifestDescriptor.Digest.String(), subImage1.ManifestDescriptor.Digest.String())
  verifyReturnedManifestDigest(t, client, baseURL, name,