added a gitlab pages pipeline

variables:

  # 45831 is the WASM fork of the tiny toolchain

  WASM_ARTIFACT_URL: https://gitlab.fi.muni.cz/api/v4/projects/45831/jobs/artifacts/master/download?job=build-emscripten

stages:

  - build

  - deploy

build:

  image: "node:20-alpine"

  stage: build

  tags:

    - shared-fi

  script:

    - wget -qO /tmp/artifacts.zip "$WASM_ARTIFACT_URL" 

    - unzip -d ./public /tmp/artifacts.zip

    - npm install

    - npm run release

    - ls -hal

  artifacts:

    paths:

      - public

    expire_in: 1 day

  rules:

    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

    - if: $CI_MERGE_REQUEST_ID

  pages:

    publish: release