fix(cli): changes file paths to relative paths for the registry client

Since the build path is in a disposable directory, it cannot be included
in the "title" annotation on the artifacts. To fix this, relative paths within
the workspace are passed to the oras client and the directory is changed before
processing.

Closes #10

Signed-off-by: Jennifer Power <barnabei.jennifer@gmail.com>

cli/build.go

@@ -206,15 +206,26 @@ func (o *BuildOptions) Run(ctx context.Context) error {
 			}
 
 			if info.Mode().IsRegular() {
-				p := renderSpace.Path(path)
-				files = append(files, p)
+				files = append(files, path)
 			}
 			return nil
 		})
 		if err != nil {
 			return err
 		}
 
+		// To allow the files to be loaded relative to the render
+		// workspace, change to the render directory. This is required
+		// to get path correct in the description annotations.
+		cwd, err := os.Getwd()
+		if err != nil {
+			return err
+		}
+		if err := os.Chdir(renderSpace.Path()); err != nil {
+			return err
+		}
+		defer os.Chdir(cwd)
+
 		descs, err := client.GatherDescriptors("", files...)
 		if err != nil {
 			return err