Update base of Dockerfile to Alpine 3.15

FROM alpine:3.12

FROM alpine:3.15

ENTRYPOINT ["/sbin/tini","--","/usr/local/searx/dockerfiles/docker-entrypoint.sh"]

EXPOSE 8080

VOLUME /etc/searx

    uwsgi \

    uwsgi-python3 \

    brotli \

 && pip3 install --upgrade pip \

 && pip3 install --upgrade pip wheel setuptools \

 && pip3 install --no-cache -r requirements.txt \

 && apk del build-dependencies \

 && rm -rf /root/.cache