Add oxipng to pre-commit checks

Author: QuLogic

.github/workflows/linting.yml

@@ -20,7 +20,11 @@ jobs:
           python-version: "3.x"
       - uses: j178/prek-action@bdca6f102f98e2b4c7029491a53dfd366469e33d  # v2.0.4
         with:
-          extra-args: --hook-stage manual --all-files
+          extra-args: --hook-stage manual --all-files --skip oxipng
+      # Only run oxipng on the last diff, because we haven't updated all images.
+      - uses: j178/prek-action@bdca6f102f98e2b4c7029491a53dfd366469e33d  # v2.0.4
+        with:
+          extra-args: --hook-stage manual --from-ref origin/${{ github.base_ref }} oxipng
 
   ruff:
     name: ruff

.pre-commit-config.yaml

@@ -135,3 +135,7 @@ repos:
         name: "Validate Conda environment file"
         files: ^environment\.yml$
         args: ["--verbose", "--schemafile", "ci/schemas/conda-environment.json"]
+  - repo: https://github.com/shssoichiro/oxipng
+    rev: d54e7c04ea58170167d95d9b2b2ec07571602fe2  # frozen: v10.1.0
+    hooks:
+      - id: oxipng