Unable to build with buildkit via bitbucket pipelines

General
1

I am attempting to build an image inside a Bitbucket Pipeline.

Inside a docker:stable container, I run the following:

export DOCKER_BUILDKIT=1
docker build --ssh default --no-cache -t worker $BITBUCKET_CLONE_DIR/worker

And I receive the following error:

docker build --ssh default --no-cache -t worker $BITBUCKET_CLONE_DIR/worker

#1 [internal] load build definition from Dockerfile
#1       digest: sha256:0cd265ebdafcc2f1032a29fe3abd3b7bfdf9b2b7d8728d102891147ca12085ff
#1         name: "[internal] load build definition from Dockerfile"
#1      started: 2019-04-23 13:55:38.983901934 +0000 UTC
#1    completed: 2019-04-23 13:55:38.984013738 +0000 UTC
#1     duration: 111.804µs
#1      started: 2019-04-23 13:55:38.984118825 +0000 UTC
#1    completed: 2019-04-23 13:55:38.985692776 +0000 UTC
#1     duration: 1.573951ms
#1        error: "no active session for mk69gwxmeuqzy4m0n6zvckl7s: context canceled: context canceled"

#2 [internal] load .dockerignore
#2       digest: sha256:8e4fd466f415b284ba7b7fda6977cc8c241f501213393f98a86ad00ffd1aab99
#2         name: "[internal] load .dockerignore"
#2      started: 2019-04-23 13:55:38.984039837 +0000 UTC
#2    completed: 2019-04-23 13:55:38.984091972 +0000 UTC
#2     duration: 52.135µs
#2      started: 2019-04-23 13:55:38.98417841 +0000 UTC
#2    completed: 2019-04-23 13:55:38.985694195 +0000 UTC
#2     duration: 1.515785ms
#2        error: "no active session for mk69gwxmeuqzy4m0n6zvckl7s: context canceled: context canceled"

failed to dial gRPC: unable to upgrade to h2c, received 403

My Dockerfile is as follows:

# syntax=docker/dockerfile:1.0.0-experimental
FROM composer:1.7 as phpdep

COPY application/database/ database/

COPY application/composer.json composer.json
COPY application/composer.lock composer.lock

# Install PHP dependencies in 'vendor'
RUN --mount=type=ssh composer install \
    --ignore-platform-reqs \
    --no-dev \
    --no-interaction \
    --no-plugins \
    --no-scripts \
    --prefer-dist

#
# Final image build stage
#
FROM alpine-base:latest as final

ADD application /app/application
COPY --from=phpdep /app/vendor/ /app/application/vendor/
ADD entrypoint.sh /entrypoint.sh

RUN \
	apk update && \
	apk upgrade && \
	apk add \
		php7 php7-mysqli php7-mcrypt php7-gd \
		php7-curl php7-xml php7-bcmath php7-mbstring \
		php7-zip php7-bz2 ca-certificates php7-openssl php7-zlib \
		php7-bcmath php7-dom php7-json php7-phar php7-pdo_mysql php7-ctype \
		php7-session php7-fileinfo php7-xmlwriter php7-tokenizer php7-soap \
		php7-simplexml && \
	cd /app/application && \
	cp .env.example .env && \
	chown nobody:nobody /app/application/.env && \
	sed -i 's/;openssl.capath=/openssl.capath=\/etc\/ssl\/certs/' /etc/php7/php.ini && \
	sed -i 's/memory_limit = 128M/memory_limit = 1024M/' /etc/php7/php.ini && \
	apk del --purge curl wget && \
	mkdir -p /var/log/workers && \
    mkdir -p /run/php && \
	echo "export PS1='WORKER \h:\w\$ '" >> /etc/profile

COPY files/logrotate.d/ /etc/logrotate.d/

CMD ["/entrypoint.sh"]
2

it’s seem like bitbucket pipelines didn’t support BuildKit feature at this time: