Docker PHP@Alpine not working couchbase PHP extension

.bashrc

# If not running interactively, don't do anything
[[ $- != *i* ]] && return

PS1='\n\[\e[1;35m\]\u\[\e[1;34m\]@\[\e[1;32m\]\h \[\e[1;31m\]\w\[\e[1;32m\]\$\[\e[0m\] '

Dockerfile

FROM php:7.0-alpine
# Alpine Linux 3.4 is used

COPY ./.bashrc /root/.

ENV BUILD_DEPS \
    binutils
#ENV PHP_EXTENSION_DEPS \
#    libcouchbase-dev \
#    php7-dev \
#    zlib-dev
ENV PHP_CONFIG_SCAN_DIR $PHP_INI_DIR/conf.d

# Install packages
RUN echo http://dl-cdn.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories \
    && echo http://dl-cdn.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories \
    && echo http://dl-cdn.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories \
    && apk add --update --no-cache \
        bash \
        php7-intl \
        php7-xdebug \
        php7-couchbase \
        php7-opcache \
        $PHPIZE_DEPS \
        $BUILD_DEPS
#        $PHP_EXTENSION_DEPS \
#        php7-couchbase=2.2.3-r1 \

# WORKING Enable and configure php extensions
COPY ./php/xdebug.ini $PHP_CONFIG_SCAN_DIR/xdebug.ini
RUN docker-php-ext-enable /usr/local/lib/php/extensions/no-debug-non-zts-20151012/opcache.so


## NOT WORKING ----------------

#RUN pecl channel-update pecl.php.net \
#    && pecl install --alldeps pcs-1.3.3 \
#    && pecl install --alldeps couchbase
#    && pecl install --alldeps couchbase-2.2.3
#RUN cp /etc/php7/conf.d/couchbase.ini $PHP_CONFIG_SCAN_DIR/couchbase.ini
# takes too long
# and
# expr: syntax error
# /tmp/pear/temp/pcs/configure: line 2517: test: =: unary operator expected
# and
# PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/couchbase.so' - Error loading shared library /usr/local/lib/php/extensions/no-debug-non-zts-20151012/couchbase.so: No such file or directory in Unknown on line 0

#RUN docker-php-ext-enable /usr/lib/php7/intl.so
# nm: /usr/lib/php7/intl.so: no symbols

#RUN cp /etc/php7/conf.d/00_intl.ini $PHP_CONFIG_SCAN_DIR/intl.ini
# PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20151012/intl.so' - Error loading shared library /usr/local/lib/php/extensions/no-debug-non-zts-20151012/intl.so: No such file or directory in Unknown on line 0
# not even with echo extension=/usr/lib/php7/intl.so > $PHP_CONFIG_SCAN_DIR/intl.ini

#COPY ./php/couchbase.ini $PHP_CONFIG_SCAN_DIR/couchbase.ini
# PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php7/couchbase.so' - Error relocating /usr/lib/php7/couchbase.so: php_log_err_with_severity: symbol not found in Unknown on line 0

#RUN docker-php-ext-enable /usr/lib/php7/couchbase.so
# nm: /usr/lib/php7/couchbase.so: no symbols
# PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php7/couchbase.so' - Error relocating /usr/lib/php7/couchbase.so: php_log_err_with_severity: symbol not found in Unknown on line 0

#RUN docker-php-ext-enable /usr/lib/php7/opcache.so
# PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php7/opcache.so' - Error relocating /usr/lib/php7/opcache.so: zend_vm_set_opcode_handler_ex: symbol not found in Unknown on line 0

#RUN docker-php-ext-enable /usr/lib/php7/modules/couchbase.so
# error:  does not exist

## ----------------------------

CMD ["bash"]

xdebug.ini

zend_extension=/usr/lib/php7/modules/xdebug.so
xdebug.remote_enable=On
xdebug.remote_autostart=0
xdebug.remote_connect_back=1