Add some comments and explanation

Signed-off-by: baalajimaestro <me@baalajimaestro.me>

build.py

@@ -3,12 +3,15 @@ import os
 from requests import get
 import ujson
 
+# Use github api and fetch the latest tag
 data = ujson.loads(
     get("https://api.github.com/repos/gohugoio/hugo/releases/latest").content
 )
 
+# Strip out the v letter
 tag = data["tag_name"][1:]
 
+# Build the image
 subprocess.run(
     [
         "docker",
@@ -20,6 +23,8 @@ subprocess.run(
         "registry.baalajimaestro.me/baalajimaestro/hugo-alpine-ext:latest",
     ]
 )
+
+# Push the newly built image
 subprocess.run(
     [
         "docker",