craft-cms: run the CMS suite in CI

* craft-cms: run the CMS suite in CI; say when system-profile checks are skipped

* craft-cms: satisfy clippy's chunks_exact_to_as_chunks lint in the total-ink test

---------

Co-authored-by: aiongg <aiongtaigi@gmail.com>

.github/workflows/cms.yml

@@ -0,0 +1,26 @@
+name: Colour management
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+    paths: ['crates/cms/**', 'Cargo.toml', 'Cargo.lock', '.github/workflows/cms.yml']
+  pull_request:
+    paths: ['crates/cms/**', 'Cargo.toml', 'Cargo.lock', '.github/workflows/cms.yml']
+
+permissions:
+  contents: read
+
+jobs:
+  cms:
+    timeout-minutes: 20
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - run: cargo clippy -p craft-cms --all-targets --all-features --locked -- -D warnings
+      # Release: the FOGRA39 fit and ink-limit tests take about 35 s in debug and 4 s here. Tests that need
+      # installed system profiles print "skipped:" when none are present.
+      - run: cargo test -p craft-cms --all-features --release --locked -- --nocapture

crates/cms/tests/cms.rs

@@ -587,6 +587,9 @@ fn system_profiles() {
             }
         }
     }
+    if seen == 0 {
+        eprintln!("skipped: no system ICC profiles found");
+    }
     eprintln!("parsed {seen} system profiles");
 }
 
@@ -614,12 +617,18 @@ fn oracle_moxcms_rgb() {
 fn oracle_moxcms_system_cmyk() {
     use moxcms::{ColorProfile, Layout, RenderingIntent, TransformOptions as MoxOpts};
     let path = "/System/Library/ColorSync/Profiles/Generic CMYK Profile.icc";
-    let Ok(bytes) = std::fs::read(path) else { return };
+    let Ok(bytes) = std::fs::read(path) else {
+        eprintln!("skipped: {path} not found");
+        return;
+    };
     let ours_p = Profile::parse(&bytes).unwrap();
     let theirs_p = ColorProfile::new_from_slice(&bytes).unwrap();
     let s = ColorProfile::new_from_slice(&srgb().to_bytes()).unwrap();
     let opts = MoxOpts { rendering_intent: RenderingIntent::RelativeColorimetric, ..Default::default() };
-    let Ok(mt) = theirs_p.create_transform_8bit(Layout::Rgba, &s, Layout::Rgb, opts) else { return };
+    let Ok(mt) = theirs_p.create_transform_8bit(Layout::Rgba, &s, Layout::Rgb, opts) else {
+        eprintln!("skipped: moxcms cannot build a transform from {path}");
+        return;
+    };
     let src: Vec<u8> = (0..2048u32).flat_map(|i| [(i * 37 % 256) as u8, (i * 91 % 256) as u8, (i * 13 % 256) as u8, (i * 57 % 256) as u8]).collect();
     let mut theirs = vec![0u8; 2048 * 3];
     mt.transform(&src, &mut theirs).unwrap();