ci: add test workflow and make build run after tests succeed

.github/workflows/build.yaml

@@ -1,19 +1,19 @@
 name: Build extensions
 
 on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'src/**'
-      - '.github/workflows/build.yaml'
+  workflow_run:
+    workflows: ["Test extensions"]
+    types:
+      - completed
 
 concurrency:
   group: ${{ github.workflow }}
   cancel-in-progress: true
 
 jobs:
   build:
+    name: Build extensions
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     env:
       CARGO_COMPONENT_VERSION: "0.11.0"
       SCCACHE_CACHE_SIZE: "2G"

.github/workflows/test.yaml

@@ -0,0 +1,100 @@
+name: Test extensions
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'src/**'
+      - '.github/workflows/test.yaml'
+
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Test modified extensions
+    env:
+      CARGO_COMPONENT_VERSION: "0.11.0"
+      SCCACHE_CACHE_SIZE: "2G"
+      SCCACHE_VERSION: "0.8.0"
+      RUSTC_WRAPPER: "/usr/local/bin/sccache"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Restore sccache cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/sccache
+          key: ${{ runner.os }}-sccache-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-sccache-
+
+      - name: Restore cargo cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index
+            ~/.cargo/registry/cache
+            ~/.cargo/git/db
+            ~/.cargo/bin
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Install sccache
+        run: |
+          if [ "${{ runner.os }}" = "Linux" ]; then
+            sccache_platform="x86_64-unknown-linux-musl"
+          elif [ "${{ runner.os }}" = "macOS" ]; then
+            sccache_platform="x86_64-apple-darwin"
+          elif [ "${{ runner.os }}" = "Windows" ]; then
+            sccache_platform="x86_64-pc-windows-msvc"
+          else
+            echo "Unsupported platform: ${{ runner.os }}"
+            exit 1
+          fi
+          sccache_file="sccache-v${SCCACHE_VERSION}-${sccache_platform}"
+          sccache_url="https://github.com/mozilla/sccache/releases/download/v${SCCACHE_VERSION}/${sccache_file}.tar.gz"
+          echo "URL=${sccache_url}"
+          curl -L "$sccache_url" | tar xz
+          mv -f "$sccache_file/sccache" "$RUSTC_WRAPPER"
+          chmod +x "$RUSTC_WRAPPER"
+
+      - name: Install wasm32-unknown-unknown target
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+          targets: wasm32-unknown-unknown
+
+      - name: Install cargo-component
+        run: |
+          if ! command -v cargo-component || ! cargo-component --version | grep -q $CARGO_COMPONENT_VERSION; then
+            cargo install cargo-component --locked --version $CARGO_COMPONENT_VERSION --force
+          fi
+
+      - name: Run tests only on modified packages
+        run: |
+          changed_files=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }})
+          changed_packages_dir=$(echo "$changed_files" | grep -o '^src/[^/]*/[^/]*' | sort -u)
+          while read -r package_dir; do
+            package_name=$(grep -oP -m 1 'name = "\K[^"]+' $package_dir/Cargo.toml)
+            echo "Running tests for $package_name"
+            cargo test --package $package_name
+          done <<< "$changed_packages_dir"
+
+      - name: Show sccache statistics
+        run: $RUSTC_WRAPPER --show-stats
+
+  rustfmt:
+    name: Check formatting
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run `cargo fmt`
+        run: cargo fmt --all -- --check