Allow Updatecli manifest/values to use JSON file

[olblak]

depends on:

• Support multiple manifest into one single file #1457

Allow to use JSON, technically speaking json a subset of YAML and therefor fully compatible.
For complex template, I find using json more convenient than yaml as we don't have to deal with tab and space

Test

To test this pull request, you can run the following commands:

cd pkg/core/config/
go test
cd ../../
go build -o bin/updatecli .
./bin/updatecli diff --config e2e/updatecli.d/success.d/npm.jso

Additional Information

Tradeoff

/

Potential improvement

[dduportal]

As long as JSON does not replace YAML, it looks ok 👍

[olblak]

As long as JSON does not replace YAML, it looks ok 👍

Hoooo no, I am not going to write Json