fix: Support localhost images in start-bootc-vm.sh

Skip podman pull for localhost/ images and add /var/tmp mount
to bootc-image-builder to prevent "no space left" errors.

pre-commit.check-secrets: ENABLED

Author: agullon

scripts/start-bootc-vm.sh

@@ -92,9 +92,14 @@ fi
 # ─────────────────────────────────────────────────────────────────────────────
 OUTPUT_DIR="${VM_DIR}/${VM_NAME}-output"
 mkdir -p "${OUTPUT_DIR}"
+mkdir -p "${VM_DIR}/bib-tmp"
 
-echo "STEP-01 Pulling ${IMAGE}..."
-sudo podman pull "${IMAGE}"
+if [[ "${IMAGE}" == localhost/* ]]; then
+    echo "STEP-01 Using local image ${IMAGE}..."
+else
+    echo "STEP-01 Pulling ${IMAGE}..."
+    sudo podman pull "${IMAGE}"
+fi
 
 echo "STEP-02 Building qcow2 from ${IMAGE}..."
 sudo podman run \
@@ -103,6 +108,7 @@ sudo podman run \
     --pull=newer \
     --security-opt label=type:unconfined_t \
     -v "${OUTPUT_DIR}":/output \
+    -v "${VM_DIR}/bib-tmp":/var/tmp \
     -v /var/lib/containers/storage:/var/lib/containers/storage \
     quay.io/centos-bootc/bootc-image-builder:latest \
     --type qcow2 \