ci: add GitHub Actions workflow (fmt, clippy, test, bun build, cargo build + site artifact)

Author: Akagi201

.github/workflows/ci.yml

@@ -0,0 +1,79 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, upgrade-deps-singlestage ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: Lint, Test, Build
+    runs-on: ubuntu-latest
+
+    env:
+      CARGO_TERM_COLOR: always
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Rust (stable)
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+
+      - name: Cache cargo registry + build
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Cargo fmt (check)
+        run: cargo fmt --all -- --check
+
+      - name: Cargo clippy
+        run: cargo clippy --workspace --all-targets -- -D warnings
+
+      - name: Cargo test
+        run: cargo test --workspace --all-features --no-fail-fast
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Cache node_modules (bun)
+        uses: actions/cache@v4
+        with:
+          path: |
+            node_modules
+            ~/.cache/bun
+          key: ${{ runner.os }}-bun-${{ hashFiles('bun.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-bun-
+
+      - name: Install JS dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Build CSS (Tailwind)
+        run: bun run build
+
+      - name: Cargo build (release)
+        run: cargo build --release
+
+      - name: Generate site (SSG)
+        run: ./target/release/typstify-ssg
+
+      - name: Upload site artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: site
+          path: |
+            site/**
+            style/output.css