[CY-2854] add --target-file option to allow output to a different file name

[tugtugtug]

Problem: -f option specifies the support of multiple files, thus the -o (target-dir) option makes sense. However, it is also desirable in certain use cases, where the user wants the input files to be processed and saved into a single file with a different file name. This is essentially what -v | tee <file> does, however there are caveats with piping the output of helm. The most annoying one is that helm prints warnings of various checks into the same stdout/stderr and will pollute the ssm -v output.

Request: add --target-file option to allow output the processed values into a single file.

[github-actions[bot]]

Internal ticket created : CY-2854

[machadoit]

Hey @tugtugtug we will not prioritise this, but please fell free to add your contribution without changing the default behaviour!