squashfs: Use zstd instead of lzo

.gitlab-ci.yml

@@ -91,7 +91,7 @@ security_scanner:
 squashfs_featurebranch:
   <<: *squashfs_template
   variables:
-    COMPRESSION_LEVEL: 5
+    COMPRESSION_LEVEL: 4
   except:
     variables:
       - $task == "security-scanner"
@@ -101,7 +101,7 @@ squashfs_featurebranch:
 squashfs_master:
   <<: *squashfs_template
   variables:
-    COMPRESSION_LEVEL: 7
+    COMPRESSION_LEVEL: 15
   only:
     refs:
       - master

packer/debian-buster.yaml

@@ -90,7 +90,7 @@ provisioners:
   - squashfs_content="$(find / -mindepth 1 -maxdepth 1 | grep -vE '^/(proc|sys|tmp|[.]dockerenv|packer-files)$')"
   - >
     mksquashfs $squashfs_content /tmp/extra/* '/tmp/images/{{user `squashfs_file`}}'
-    -comp lzo
+    -comp zstd
     -Xcompression-level {{user `compression_level`}}
     -ef /tmp/ignore_files
   type: shell