ci: add clang-format, ktlint, and cargo test to lint job

- Rename lint-rust → lint, add clang-format and ktlint checks
- Add cargo test step for zygisk unit tests
- Install clang-format and ktlint 1.8.0 in CI Docker image

.github/docker/ci/Dockerfile

@@ -19,9 +19,16 @@ RUN apt-get update && \
         openjdk-17-jdk-headless \
         bc kmod cpio flex bison libssl-dev libelf-dev \
         binutils-aarch64-linux-gnu \
+        clang-format \
         git && \
     rm -rf /var/lib/apt/lists/*
 
+# ── ktlint (for lsposed / test-app Kotlin) ──────────────────────────
+ENV KTLINT_VERSION=1.8.0
+RUN curl -fsSL -o /usr/local/bin/ktlint \
+        "https://github.com/pinterest/ktlint/releases/download/${KTLINT_VERSION}/ktlint" && \
+    chmod +x /usr/local/bin/ktlint
+
 # ── Rust toolchain (for zygisk) ──────────────────────────────────────
 ENV RUSTUP_HOME=/usr/local/rustup \
     CARGO_HOME=/usr/local/cargo \

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ permissions:
   packages: read
 
 jobs:
-  lint-rust:
+  lint:
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/${{ github.repository }}/ci:latest
@@ -25,6 +25,8 @@ jobs:
           submodules: recursive
       - name: Mark workspace safe
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
+
+      # Rust
       - name: rustfmt
         run: |
           cd zygisk && cargo fmt --check
@@ -33,6 +35,16 @@ jobs:
         run: cd zygisk && cargo ndk -t arm64-v8a clippy -- -D warnings
       - name: clippy (test-app)
         run: cd test-app/native && cargo ndk -t arm64-v8a clippy -- -D warnings
+      - name: cargo test (zygisk)
+        run: cd zygisk && cargo test
+
+      # C (kernel module)
+      - name: clang-format
+        run: clang-format --dry-run --Werror kmod/vpnhide_kmod.c
+
+      # Kotlin
+      - name: ktlint
+        run: ktlint "lsposed/**/*.kt" "test-app/**/*.kt"
 
   kmod:
     runs-on: ubuntu-latest