An alternative to @BLUEFROG’s approach might be a script that appends something like
<div class=!tag-line">...your tags ...</div>
to the MD file and then use CSS and a @media
selector to position the tags:
.tag-line {
bottom: 1em; /* or something like that, some experimenting might be in order
}
supposing that you’re not going to print the raw Markdown, of course. More on CSS here