try mounting

Dockerfile

@@ -1,11 +1,12 @@
 # syntax=docker/dockerfile:1.4-labs
 FROM ubuntu:24.04 as base
 ENV DEBIAN_FRONTEND=noninteractive
-ENV ROOTFS=/tmp/restore
+ARG ROOTFS=/tmp/restore
 ARG SSH_HOST
 ARG SSH_USER
 ARG SSH_PATH=/var/tmp/restic
 
+RUN echo $ROOTFS ; exit 1
 RUN apt update && apt install -yq wget bzip2 make time sshfs fuse3 && \
     wget -qO - https://raw.githubusercontent.com/cupcakearmy/autorestic/master/install.sh | bash && \
     autorestic --version && \
@@ -17,7 +18,7 @@ WORKDIR /var/tmp/restic
 RUN --security=insecure --mount=type=ssh sshfs -v -o auto_cache,reconnect,transform_symlinks,follow_symlinks ${SSH_USER}@${SSH_HOST}:${SSH_PATH} /var/tmp/restic && \
     cd /var/tmp/restic && \
     ls -la && \
-    make restore && rm -rf /var/tmp/restic/*
+    make restore
 
 WORKDIR ${ROOTFS}
 RUN --security=insecure \

Makefile

@@ -47,6 +47,7 @@ build:
 	--volume $(CURRENT_DIR):/tmp/work \
 	--volume "$${HOME}/.docker:/root/.docker:ro" \
 	--volume $(SSH_AUTH_SOCK):$(SSH_AUTH_SOCK) \
+	--volume $(RESTORE_DST):$(RESTORE_DST) \
 	--entrypoint buildctl-daemonless.sh \
 	moby/buildkit:master \
 		build \
@@ -56,5 +57,6 @@ build:
 		--allow security.insecure \
 		--opt build-arg:SSH_USER=$(SSH_USER) \
 		--opt build-arg:SSH_HOST=$(SSH_HOST) \
+		--opt build-arg:ROOTFS=$(RESTORE_DST) \
 		--output type=image,name=$(IMAGE_PROVIDER)/$(IMAGE),push=true \
 		--ssh default=$(SSH_AUTH_SOCK)