Only append markdown if format isn't JSON

[flcdrg]

Fixes #100

[mre]

That works. However I'm wondering if we should check if the format is Markdown instead. Would cover all cases.

[mre]

For some background: we only want to append a Markdown link if the format is Markdown.

[flcdrg]

I noticed there were other formats supported by lychee, but I wasn't sure if they were 'markdown-ish' or not

[mre]

Yeah there are others. Currently we have compact, detailed, json, and markdown. I'd say we only want to add the link for the markdown format. The others are plaintext or JSON.

[flcdrg]

Updated to just apply to markdown

[mre]

Shouldn't it be two equal signs?

    if [ "${INPUT_FORMAT}" == "markdown" ]; then
        echo "[Full Github Actions output](${GITHUB_WORKFLOW_URL})" >> "${INPUT_OUTPUT}"
    fi

[flcdrg]

argh.. mis-read a reference page.

[mre]

Thanks for the contribution @flcdrg. 🥳