pre-commit: add oxipng a lossless PNG compression optimizer

"Lossless compression is a data compression technique where the original data can be perfectly
reconstructed from the compressed data. In essence, no information is lost during compression
and decompression, making it ideal for situations where data integrity is critical"

https://en.wikipedia.org/wiki/Lossless_compression

https://github.com/oxipng/oxipng

https://github.com/oxipng/oxipng?tab=readme-ov-file#git-integration-via-pre-commit

Ran pre-commit here locally and it compressed the images on first run.

So we have less data for some images with the same quality.

Less data means less to download etc and saves bandwidth.

Author: jbampton

.pre-commit-config.yaml

@@ -25,6 +25,13 @@ repos:
     hooks:
       - id: identity
       - id: check-hooks-apply
+  - repo: https://github.com/shssoichiro/oxipng
+    rev: v9.1.4
+    hooks:
+      - id: oxipng
+        name: run oxipng
+        description: optimize PNG images with lossless compression
+        args: ['-o', '4', '--strip', 'safe', '--alpha']
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.6.0
     hooks: