feat(imaging): add pure-Rust Skia backend (#112)

.gitea/workflows/ci.yml

@@ -16,6 +16,35 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  rust-skia:
+    name: rust-skia (Rust only)
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    env:
+      CARGO_BUILD_JOBS: "1"
+      CARGO_INCREMENTAL: "0"
+      CARGO_PROFILE_DEV_DEBUG: "0"
+      CARGO_PROFILE_TEST_DEBUG: "0"
+    steps:
+      - uses: actions/checkout@v4
+
+      # Deliberately do not install CMake, Clang, pkg-config, Skia, WebP, or
+      # any other native codec prerequisite in this job.
+      - name: Install pinned Rust
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: 1.97.1
+          targets: wasm32-unknown-unknown
+
+      - name: Test the pure-Rust Skia-compatible extension
+        run: cargo test --locked -j 1 -p libremetaverse-imaging-skia --no-default-features --features rust-skia
+
+      - name: Audit the normal and build dependency graph
+        run: cargo tree --locked -p libremetaverse-imaging-skia --no-default-features --features rust-skia -e normal,build
+
+      - name: Compile the same Rust codec for WASM
+        run: cargo check --locked -j 1 -p libremetaverse-imaging-skia --no-default-features --features rust-skia --target wasm32-unknown-unknown
+
   required:
     name: required
     runs-on: ubuntu-latest