HTML export: Force links that end in .jpg or .png to be exported as a tags

[Rodrigo Morales]

Consider the following Org document:

#+HEADER: :tangle /tmp/a.org
#+BEGIN_SRC org
,#+TITLE: My document
,#+DATE: 2024-07-17

This is a link that ends in html: foo https://example.org/a.html bar

This is a link that ends in txt: foo https://example.org/a.txt bar

This is a link that ends in jpg: foo https://example.org/a.jpg bar

This is a link that ends in png: foo https://example.org/a.png bar
#+END_SRC

I started Emacs using the following command:

#+BEGIN_SRC sh
emacs \
  --quick \
  --eval='(find-file "/tmp/a.org")' \
  --eval='(org-html-export-as-html)'
#+END_SRC

The following code block shows the relevant content in the buffer =*Org HTML 
Export*=.

#+BEGIN_SRC html
<div id="content" class="content">
<h1 class="title">My document</h1>
<p>
This is a link that ends in html: foo <a 
href="https://example.org/a.html";>https://example.org/a.html</a> bar
</p>

<p>
This is a link that ends in txt: foo <a 
href="https://example.org/a.txt";>https://example.org/a.txt</a> bar
</p>

<p>
This is a link that ends in jpg: foo <img src="https://example.org/a.jpg"; 
alt="a.jpg" /> bar
</p>

<p>
This is a link that ends in png: foo <img src="https://example.org/a.png"; 
alt="a.png" /> bar
</p>
</div>
#+END_SRC

As we can see above, links that end in =html= or =txt= are exported as =a= 
tags, while links that end in =jpg= or =png= are exported as =img= tags.

I want links that end in =.jpg= or =.png= to also be =a= tags. The
reason is that in my use case, I need to display a link (i.e. a =a= tag)
inside a paragraph of an image hosted at Wikimedia Commons in the HTML
export. For example: 
https://commons.wikimedia.org/wiki/File:Banana_on_whitebackground.jpg

My question is: How to force a link that end in =.jpg= or =.png= to be exported 
as a =a= tag instead of an =img= tag?