Add ci and publish workflows

Author: Sytten

.github/CODEOWNERS

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+* @sytten

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+concurrency:
+  group: ci-${{ github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@315e265cd78dad1e1dcf3a5074f6d6c47029d5aa
+        with:
+          toolchain: stable
+          components: rustfmt, clippy
+
+      - name: Format
+        run: cargo fmt --all -- --check
+
+      - name: Clippy
+        run: cargo clippy --all-features -- -D warnings
+
+      - name: Test
+        run: cargo test

.github/workflows/publish.yml

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+name: Publish
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+*'
+
+jobs:
+  publish:
+    if: github.repository == 'rquickjs/rquickjs-serde'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203
+        with:
+          toolchain: stable
+
+      - name: Publish crates
+        uses: katyo/publish-crates@02cc2f1ad653fb25c7d1ff9eb590a8a50d06186b
+        with:
+          registry-token: ${{ secrets.CRATES_TOKEN }}