[REF] build.sh: Replace diff-highlight with git-delta for git pager

[moylop260]

• Install git-delta instead of the unmaintained diff-highlight package
  • Latest change 2years ago https://github.com/tk0miya/diff-highlight
• Configure delta as the default Git pager
• Enable line numbers and navigation
• Set DarkNeon as the default syntax theme
• Enable zdiff3 merge conflict style
• Fix the following warning running git diff

    /usr/lib/python3/dist-packages/highlights/command.py:33: SyntaxWarning: invalid escape sequence '\['
    stripped = re.sub('\x1b\[[0-9;]*m', '', rawline.rstrip("\r\n"))
    /usr/lib/python3/dist-packages/highlights/command.py:36: SyntaxWarning: invalid escape sequence '\w'
    if re.match('^(@|commit \w+$)', stripped):
    /usr/lib/python3/dist-packages/highlights/command.py:39: SyntaxWarning: invalid escape sequence '\-'
    if not re.match('^(?:[ +\-@\\\\]|diff)', stripped):
    /usr/lib/python3/dist-packages/highlights/pprint.py:181: SyntaxWarning: invalid escape sequence '\s'
    is_word = lambda s: re.match('^(%s+|\s+)$' % chars, s[0])
    /usr/lib/python3/dist-packages/highlights/pprint.py:183: SyntaxWarning: invalid escape sequence '\-'
    marks = '[ !"#$%&\'()*+,\-./:;<=>?@\[\\]^_{|}~]'
    /usr/lib/python3/dist-packages/highlights/pprint.py:186: SyntaxWarning: invalid escape sequence '\s'
    is_mark = lambda s: re.match('^(%s+|\s+)$' % marks, s[0])
    /usr/lib/python3/dist-packages/highlights/pprint.py:232: SyntaxWarning: invalid escape sequence '\s'
    if (inserted[0][0] == "+" and re.match('^\s*$', inserted[1][0]) and
    /usr/lib/python3/dist-packages/highlights/pprint.py:233: SyntaxWarning: invalid escape sequence '\s'
    deleted[0][0] == "-" and re.match('^\s*$', deleted[1][0])):

Before:

• 

After:

• 

[moylop260]

@luisg123v review please

[desdelinux]

Right direction — the pip diff-highlight package is unmaintained and is the source of those Python 3.12 SyntaxWarnings, and the delta setup itself matches upstream's recommended config (diffFilter = delta --color-only for git add -p, DarkNeon is a valid theme, and less stays installed as the underlying pager).

Requesting changes for one real issue: this template runs on whatever {{ image }} each project uses, and on pre-23.04 Ubuntu bases (15.0 is focal, 16.0/17.0 are jammy) the current form breaks the whole apt transaction, the git pager, and merges — details inline. It works as-is on noble, which I assume is where the screenshots come from.

[desdelinux]

All points from my previous review are addressed: delta now comes from the pinned GitHub releases .deb using the same fail-safe pattern as ngrok (so the main apt transaction is never at risk on older bases), the gitconfig is gated on command -v delta, zdiff3 and the redundant side-by-side are gone, and the comment was updated.

I also verified the constructed URL against the release: git-delta_0.18.2_amd64.deb exists under the 0.18.2 tag of dandavison/delta.

A few non-blocking nits inline. LGTM 👍

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.98%. Comparing base (bd819e3) to head (e1f761f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #234   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files           7        7           
  Lines         610      610           
  Branches       90       90           
=======================================
  Hits          494      494           
  Misses         83       83           
  Partials       33       33           

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