chore: add prek pre-commit hook configuration and CI

Add prek.toml with hooks for trailing whitespace, end-of-file, YAML/TOML/JSON
validation, merge conflict detection, large file checks, cargo fmt, ruff
lint+format, go vet, shellcheck, and conventional commit messages.

Fix minor lint issues: add missing docstring in test_outputs.py, remove unused
variable assignment in vmm-cli.py.

Author: kvinwang

.github/workflows/prek-check.yml

@@ -0,0 +1,47 @@
+# SPDX-FileCopyrightText: © 2025 Phala Network <dstack@phala.network>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Pre-commit checks
+
+on:
+  push:
+    branches: [ master, next, dev-* ]
+  pull_request:
+    branches: [ master, next, dev-* ]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: 1.92.0
+        components: rustfmt
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.22'
+
+    - name: Install prek
+      run: pip install prek
+
+    - name: Run pre-commit checks (PR)
+      if: github.event_name == 'pull_request'
+      run: prek run --from-ref ${{ github.event.pull_request.base.sha }} --to-ref ${{ github.event.pull_request.head.sha }} --show-diff-on-failure
+
+    - name: Run pre-commit checks (push)
+      if: github.event_name == 'push'
+      run: prek run --from-ref ${{ github.event.before }} --to-ref ${{ github.event.after }} --show-diff-on-failure

prek.toml

@@ -0,0 +1,68 @@
+# =============================================================================
+# prek configuration for dstack
+# =============================================================================
+
+# --- General hooks (trailing whitespace, file checks, etc.) ---
+[[repos]]
+repo = "https://github.com/pre-commit/pre-commit-hooks"
+rev = "v5.0.0"
+hooks = [
+    { id = "trailing-whitespace", args = ["--markdown-linebreak-ext=md"] },
+    { id = "end-of-file-fixer" },
+    { id = "check-yaml", args = ["--allow-multiple-documents"], exclude = "gateway/templates/" },
+    { id = "check-toml" },
+    { id = "check-json" },
+    { id = "check-merge-conflict" },
+    { id = "check-added-large-files", args = ["--maxkb=500"] },
+    { id = "check-symlinks" },
+    { id = "mixed-line-ending", args = ["--fix=lf"] },
+]
+
+# --- Rust: rustfmt ---
+[[repos]]
+repo = "local"
+
+[[repos.hooks]]
+id = "cargo-fmt"
+name = "cargo fmt"
+entry = "cargo fmt --all"
+language = "system"
+types = ["rust"]
+pass_filenames = false
+
+# --- Python: ruff (lint + format) ---
+[[repos]]
+repo = "https://github.com/astral-sh/ruff-pre-commit"
+rev = "v0.11.4"
+hooks = [
+    { id = "ruff", args = ["--fix"] },
+    { id = "ruff-format" },
+]
+
+# --- Go: go vet ---
+[[repos]]
+repo = "local"
+
+[[repos.hooks]]
+id = "go-vet"
+name = "go vet"
+entry = "bash -c 'cd sdk/go && go vet ./...'"
+language = "system"
+files = "sdk/go/.*\\.go$"
+pass_filenames = false
+
+# --- Shell: shellcheck ---
+[[repos]]
+repo = "https://github.com/shellcheck-py/shellcheck-py"
+rev = "v0.10.0.1"
+hooks = [
+    { id = "shellcheck" },
+]
+
+# --- Conventional commits (used by cliff.toml for changelog) ---
+[[repos]]
+repo = "https://github.com/compilerla/conventional-pre-commit"
+rev = "v4.1.0"
+hooks = [
+    { id = "conventional-pre-commit", stages = ["commit-msg"] },
+]

sdk/python/test_outputs.py

@@ -2,20 +2,20 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+"""Test script for verifying Python SDK outputs."""
+
 import asyncio
 import sys
 
-from dstack_sdk import (
-    DstackClient,
-    AsyncDstackClient,
-    TappdClient,
-    AsyncTappdClient,
-    get_compose_hash,
-    verify_env_encrypt_public_key,
-)
+from dstack_sdk import AsyncDstackClient
+from dstack_sdk import AsyncTappdClient
+from dstack_sdk import DstackClient
+from dstack_sdk import TappdClient
+from dstack_sdk import get_compose_hash
+from dstack_sdk import verify_env_encrypt_public_key
 
 
-async def main():
+async def main():  # noqa: D103
     print("=== Python SDK Output Test ===")
 
     try:
@@ -49,7 +49,7 @@ async def main():
 
             account = to_account(eth_key)
             print(f"  address: {account.address}")
-            print(f"  type: ethereum account")
+            print("  type: ethereum account")
         except ImportError:
             print(
                 "  error: Ethereum integration not available (install with pip install 'dstack-sdk[eth]')"
@@ -63,7 +63,7 @@ async def main():
 
             account_secure = to_account_secure(eth_key)
             print(f"  address: {account_secure.address}")
-            print(f"  type: ethereum account")
+            print("  type: ethereum account")
         except ImportError:
             print(
                 "  error: Ethereum integration not available (install with pip install 'dstack-sdk[eth]')"