build html5ever in CI

.github/actions/install/action.yml

@@ -58,3 +58,13 @@ runs:
       run: |
         mkdir -p v8
         ln -s ${{ inputs.cache-dir }}/v8/libc_v8.a v8/libc_v8.a
+
+    - name: hmtl5ever release
+      if: ${{ inputs.mode == 'release' }}
+      shell: bash
+      run: zig build -Doptimize=ReleaseFast html5ever
+
+    - name: hmtl5ever debug
+      if: ${{ inputs.mode == 'debug' }}
+      shell: bash
+      run: zig build html5ever