Upgrade csvu to Zig 0.16 (#2)

* Port source to Zig 0.16

* Declare Zig 0.16 toolchain

* ci: add pr verification

.github/workflows/release.yaml

@@ -51,20 +51,19 @@ jobs:
       - name: Install Zig
         uses: mlugg/setup-zig@v2
         with:
-          version: 0.15.0
+          version: 0.16.0
 
       - name: Build for ${{ matrix.triple }}
         run: |
-          zig build-exe "${SRC}" \
+          zig build \
             -Dtarget=${{ matrix.triple }} \
-            -O ReleaseSafe \
-            -femit-bin="${BINARY_NAME}${{ matrix.ext }}"
+            -Doptimize=ReleaseSafe
 
       - name: Package binary
         run: |
           mkdir -p artifacts
           zip -j artifacts/"${BINARY_NAME}-${{ github.ref_name }}-${{ matrix.triple }}.zip" \
-            "${BINARY_NAME}${{ matrix.ext }}"
+            "zig-out/bin/${BINARY_NAME}${{ matrix.ext }}"
 
       - name: Upload release asset
         uses: actions/upload-release-asset@v1