Speed up tests

[cniackz]

Fixes https://github.com/miniohq/engineering/issues/539

The idea of this PR is to speed up tests by using the cache to share those files that are used in different spots.

The most transcendental part is this:

      - name: Get yarn cache directory path
        id: yarn-cache-dir-path
        run: echo "::set-output name=dir::$(yarn cache dir)"

      - uses: actions/cache@v2
        id: yarn-cache
        with:
          path: |
            ${{ steps.yarn-cache-dir-path.outputs.dir }}
            ./portal-ui/node_modules/
            ./portal-ui/build/
          key: ${{ runner.os }}-yarn-${{ hashFiles('./portal-ui/yarn.lock') }}
          restore-keys: |
            ${{ runner.os }}-yarn-

      - name: Install Dependencies
        if: steps.yarn-cache.outputs.cache-hit != 'true'
        working-directory: ./
        run: make assets

Basically, we put in cache all those files that are needed, so we don't run make assets over and over.

Where Install Dependencies is skipped

Secondly, we execute lint and no warning tests first and then the rest in order to skip dependant jobs if lint is not passing: