Add compile restic binary for CVE fix

Signed-off-by: Ming <mqiu@vmware.com>

hack/build-restic.sh

@@ -22,6 +22,7 @@ set -o pipefail
 # is the path expected by the Velero Dockerfile.
 output_dir=${OUTPUT_DIR:-/output/usr/bin}
 restic_bin=${output_dir}/restic
+build_path=$(dirname "$PWD")
 
 if [[ -z "${BIN}" ]]; then
     echo "BIN must be set"
@@ -46,8 +47,9 @@ if [[ -z "${RESTIC_VERSION}" ]]; then
     exit 1
 fi
 
-curl -s -L https://github.com/restic/restic/releases/download/v${RESTIC_VERSION}/restic_${RESTIC_VERSION}_${GOOS}_${GOARCH}.bz2 -O
-bunzip2 restic_${RESTIC_VERSION}_${GOOS}_${GOARCH}.bz2
-mv restic_${RESTIC_VERSION}_${GOOS}_${GOARCH} ${restic_bin}
-
+mkdir ${build_path}/restic
+git clone -b v${RESTIC_VERSION} https://github.com/restic/restic.git ${build_path}/restic
+pushd ${build_path}/restic
+go run build.go -o ${restic_bin}
 chmod +x ${restic_bin}
+popd