scripts/build-container.sh: Use specific buildkit image version

Reproducibility also depends on using the same buildkit version as the
pipeline. E.g., v0.13.0 and v0.16.0 generate different tar archives.

We are currently on v0.16.0 in the pipeline, enforce this also locally.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

scripts/build-container.sh

@@ -25,6 +25,9 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
+# This needs to be aligned with .github/actions/docker-init/action.yml
+BUILDKIT="moby/buildkit:v0.16.0"
+
 usage()
 {
 	DEFAULT_DEBIAN_TAG=$(grep -m 1 'ARG DEBIAN_TAG=' "$(dirname "$0")/../Dockerfile" |
@@ -130,6 +133,11 @@ if [ "$CLEAN" = y ]; then
 	done
 fi
 
+if ! docker buildx inspect | grep -q "Driver Options:.*$BUILDKIT"; then
+	BUILDX_INSTANCE=$(docker buildx create --driver-opt image="$BUILDKIT")
+	docker buildx use "$BUILDX_INSTANCE"
+fi
+
 KAS_CLONE=$(mktemp -d --tmpdir kas-tmp.XXXXXXXXXX)
 git clone . "$KAS_CLONE"
 cd "$KAS_CLONE" || exit 1