Add Restic builder in Dockerfile.

Signed-off-by: Xun Jiang <blackpiglet@gmail.com>

hack/build-restic.sh

@@ -50,6 +50,7 @@ fi
 mkdir ${build_path}/restic
 git clone -b v${RESTIC_VERSION} https://github.com/restic/restic.git ${build_path}/restic
 pushd ${build_path}/restic
+git apply /go/src/github.com/vmware-tanzu/velero/hack/modify_acces_denied_code.txt
 go run build.go --goos "${GOOS}" --goarch "${GOARCH}" --goarm "${GOARM}" -o ${restic_bin}
 chmod +x ${restic_bin}
 popd

hack/modify_acces_denied_code.txt

@@ -0,0 +1,13 @@
+diff --git a/internal/backend/s3/s3.go b/internal/backend/s3/s3.go
+index 0b3816c06..eec10f9c7 100644
+--- a/internal/backend/s3/s3.go
++++ b/internal/backend/s3/s3.go
+@@ -164,7 +164,7 @@ func isAccessDenied(err error) bool {
+ 	debug.Log("isAccessDenied(%T, %#v)", err, err)
+ 
+ 	var e minio.ErrorResponse
+-	return errors.As(err, &e) && e.Code == "Access Denied"
++	return errors.As(err, &e) && e.Code == "AccessDenied"
+ }
+ 
+ // IsNotExist returns true if the error is caused by a not existing file.