Use virt-sparsify again to reduce image size

Signed-off-by: Christian Berendt <[email protected]>

.cirrus.yml

@@ -29,7 +29,7 @@ build_task_template: &BUILD_TASK_TEMPLATE
     while fuser /var/lib/dpkg/lock >/dev/null 2>&1; do sleep 5; done;
     while fuser /var/lib/dpkg/lock-frontend >/dev/null 2>&1; do sleep 5; done;
     apt-get update
-    apt-get install -y git make python3-pip curl jq unzip
+    apt-get install -y git make python3-pip curl jq unzip libguestfs-tools
 
   prepare_script: |
     git clone https://github.com/kubernetes-sigs/image-builder
@@ -52,6 +52,12 @@ build_task_template: &BUILD_TASK_TEMPLATE
     mv image-builder/images/capi/output/ubuntu-2204-kube-v$IMAGE_IDENTIFIER/last-$IMAGE_IDENTIFIER .
     cat last-$IMAGE_IDENTIFIER
 
+  sparsify_script: |
+    pushd image-builder/images/capi/output/ubuntu-2204-kube-v$IMAGE_IDENTIFIER
+    find . -name '*.qcow2' -execdir bash -c 'x={}; virt-sparsify --in-place $x' \;
+    popd
+    ls -lah
+
   push_script: |
     if [[ "$CIRRUS_BRANCH" == "main" ]]; then
       wget https://dl.min.io/client/mc/release/linux-amd64/mc