compression algorithm should be none or lz4_block

[wswsmao]

I get error like this.
according to
https://github.com/dragonflyoss/nydus/blob/master/docs/chunk-deduplication.md

$ RUST_BACKTRACE=1 nydusify chunkdict generate --sources  abushwang/redis:7.2.6-nydusify,abushwang/redis:7.4-nydusify,abushwang/redis:7.4.1-nydusify --target abushwang/redis:nydus_chunkdict --source-insecure --target-insecure
INFO[2024-11-04T02:51:53Z] Parsing image abushwang/redis:7.2.6-nydusify 
INFO[2024-11-04T02:51:59Z] Pulling Nydus bootstrap to output/abushwang:redis:7.2.6-nydusify/nydus_bootstrap 
INFO[2024-11-04T02:52:01Z] Parsing image abushwang/redis:7.4-nydusify   
INFO[2024-11-04T02:52:07Z] Pulling Nydus bootstrap to output/abushwang:redis:7.4-nydusify/nydus_bootstrap 
INFO[2024-11-04T02:52:10Z] Parsing image abushwang/redis:7.4.1-nydusify 
INFO[2024-11-04T02:52:16Z] Pulling Nydus bootstrap to output/abushwang:redis:7.4.1-nydusify/nydus_bootstrap 
INFO[2024-11-04T02:52:18Z] Invoking 'nydus-image chunkdict generate' command 
Warning: Blob with id '33b39229606897a7712995a726e992d8d96ce864a5c2c8e6a3b19e79b7bee53e' is smaller than 4096 bytes.
[2024-11-04 02:53:37.862528 +00:00] ERROR [/src/error.rs:18] Stack:
   0: nydus_api::error::make_error

[2024-11-04 02:53:37.862586 +00:00] ERROR [/src/error.rs:19] Error:
        "compression algorithm should be none or lz4_block"
        at utils/src/compress/mod.rs:45
Error: Invalid argument (os error 22)
ERRO[2024-11-04T02:53:37Z] fail to run nydus-image [chunkdict generate --log-level warn --bootstrap output/chunkdict_bootstrap --database sqlite:///home/abushwang/nydus-static-2.3.0/output/database.db --output-json output/nydus_bootstrap_output.json output/abushwang:redis:7.2.6-nydusify/nydus_bootstrap output/abushwang:redis:7.4-nydusify/nydus_bootstrap output/abushwang:redis:7.4.1-nydusify/nydus_bootstrap]  error="exit status 1"
FATA[2024-11-04T02:53:37Z] invalid nydus bootstrap format: exit status 1 

I get nydusify images by this command:

$ nydusify convert --source abushwang/redis:$source_tag --target abushwang/redis:$source_tag-nydusify

nydusify comes from this:

$ wget https://github.com/dragonflyoss/nydus/releases/download/v2.3.0/nydus-static-v2.3.0-linux-amd64.tgz

[wswsmao]

I have add --compressor, but not work

$ nydusify convert --compressor none --source abushwang/redis:$source_tag --target abushwang/redis:$source_tag-nfy_lz

...

$ nydusify convert --compressor lz4_block --source abushwang/redis:$source_tag --target abushwang/redis:$source_tag-nfy_lz

[imeoer]

@cslinwang PTAL.