Better formatting for auto generated PR description

[jenhagg]

Purpose

When we run the workflow to update packages, add a summary to the PR that is created.

What the code is doing

• Parse the json into additions/deletions/updates using jq
• Escape newlines in each one so they can be set as output variables (since github will truncate multi line outputs)

Testing

Manually triggered the workflow and checked the resulting PR #228

Time estimate

5 min

[rouille]

The output looks good. Also never heard of jq, thanks for introducing it to me.

[jenhagg]

The output looks good. Also never heard of jq, thanks for introducing it to me.

Yeah jq is nice, this is the first time I'm using it. Actually, I bet this whole thing could have been a jq program.

[rouille]

The output looks good. Also never heard of jq, thanks for introducing it to me.

Yeah jq is nice, this is the first time I'm using it. Actually, I bet this whole thing could have been a jq program.

As you know, I am a big fan of sed & awk (I have the book) and it seems that jq accomplishes similar things.