fix: avoid BLOB_UNKNOWN by not enabling ForceBuildMetadata

Ref: #385
Ref: coder/kaniko#34

Author: mafredri

envbuilder.go

@@ -541,7 +541,7 @@ func run(ctx context.Context, opts options.Options, execArgs *execArgsInfo) erro
 				NoPush:             !opts.PushImage || len(destinations) == 0,
 				CacheRunLayers:     true,
 				CacheCopyLayers:    true,
-				ForceBuildMetadata: opts.PushImage, // Force layers with no changes to be cached, required for cache probing.
+				ForceBuildMetadata: false, // Force layers with no changes to be cached, required for cache probing.
 				CompressedCaching:  true,
 				Compression:        config.ZStd,
 				// Maps to "default" level, ~100-300 MB/sec according to
@@ -1269,7 +1269,7 @@ func RunCacheProbe(ctx context.Context, opts options.Options) (v1.Image, error)
 		NoPush:             true,
 		CacheRunLayers:     true,
 		CacheCopyLayers:    true,
-		ForceBuildMetadata: true, // Force layers with no changes to be cached, required for cache probing.
+		ForceBuildMetadata: false, // Force layers with no changes to be cached, required for cache probing.
 		CompressedCaching:  true,
 		Compression:        config.ZStd,
 		// Maps to "default" level, ~100-300 MB/sec according to

go.mod

@@ -4,7 +4,7 @@ go 1.22.4
 
 // There are a few options we need added to Kaniko!
 // See: https://github.com/GoogleContainerTools/kaniko/compare/main...coder:kaniko:main
-replace github.com/GoogleContainerTools/kaniko => github.com/coder/kaniko v0.0.0-20241028054616-350cbb820e05
+replace github.com/GoogleContainerTools/kaniko => github.com/coder/kaniko v0.0.0-20241107190527-8aeb946dfc4d
 
 // Required to import codersdk due to gvisor dependency.
 replace tailscale.com => github.com/coder/tailscale v1.1.1-0.20240702054557-aa558fbe5374

go.sum

@@ -171,8 +171,8 @@ github.com/cockroachdb/errors v1.2.4/go.mod h1:rQD95gz6FARkaKkQXUksEje/d9a6wBJoC
 github.com/cockroachdb/logtags v0.0.0-20190617123548-eb05cc24525f/go.mod h1:i/u985jwjWRlyHXQbwatDASoW0RMlZ/3i9yJHE2xLkI=
 github.com/coder/coder/v2 v2.10.1-0.20240704130443-c2d44d16a352 h1:L/EjCuZxs5tOcqqCaASj/nu65TRYEFcTt8qRQfHZXX0=
 github.com/coder/coder/v2 v2.10.1-0.20240704130443-c2d44d16a352/go.mod h1:P1KoQSgnKEAG6Mnd3YlGzAophty+yKA9VV48LpfNRvo=
-github.com/coder/kaniko v0.0.0-20241028054616-350cbb820e05 h1:KZc6vG/WnSWG8RtUevGrCdZbF7XJaaZ32ocig6sZLQk=
-github.com/coder/kaniko v0.0.0-20241028054616-350cbb820e05/go.mod h1:3rM/KOQ4LgF8mE+O1P6pLDa/E57mzxIxNdUOMKi1qpg=
+github.com/coder/kaniko v0.0.0-20241107190527-8aeb946dfc4d h1:qqoyQMtIHWYRw8RbDPT+pdOQER9UKm36tsJtiy9MVc8=
+github.com/coder/kaniko v0.0.0-20241107190527-8aeb946dfc4d/go.mod h1:3rM/KOQ4LgF8mE+O1P6pLDa/E57mzxIxNdUOMKi1qpg=
 github.com/coder/pretty v0.0.0-20230908205945-e89ba86370e0 h1:3A0ES21Ke+FxEM8CXx9n47SZOKOpgSE1bbJzlE4qPVs=
 github.com/coder/pretty v0.0.0-20230908205945-e89ba86370e0/go.mod h1:5UuS2Ts+nTToAMeOjNlnHFkPahrtDkmpydBen/3wgZc=
 github.com/coder/quartz v0.1.0 h1:cLL+0g5l7xTf6ordRnUMMiZtRE8Sq5LxpghS63vEXrQ=