[File] add line matcher to File resource

[olblak]

Add parameter "line" to identify a specific line.
It behaves differently depending on the stage

source
Return the first list that contain the string

condition
Return true for the first line that match the string

target
Update file based on the first line returned from string

Signed-off-by: Olivier Vernin olivier@vernin.me

[olblak]

I am starting to wonder if it's the proper place to put this.
Maybe it's better to add transformer rule to #160 to include a line, includeOnly, and exclude lines

Like

transformers:
    - line:
        includeOnly: "arm64" # Only takes the line containing the string "arm64"

transformers:
    - line:
        exclude: 
           - "arm64" # Exclude the line containing the string "arm64"
           - "amd64" # Also exclude the line containing the string "amd64"

[olblak]

Rename:

• IncludesOnly by Include
• Include by "HasIncludes"