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ci: use locally built gem file for testing Docker image build
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FROM alpine:3.13.5 | ||
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EXPOSE 5353 8080 | ||
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COPY pkg/dyndnsd-*.gem /tmp/dyndnsd.gem | ||
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RUN apk --no-cache add openssl ca-certificates && \ | ||
apk --no-cache add ruby ruby-etc ruby-io-console ruby-json ruby-webrick && \ | ||
apk --no-cache add --virtual .build-deps linux-headers ruby-dev build-base tzdata && \ | ||
gem install --no-document /tmp/dyndnsd.gem && \ | ||
rm -rf /usr/lib/ruby/gems/*/cache/ && \ | ||
# set timezone to Berlin | ||
cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime && \ | ||
apk del .build-deps | ||
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# Follow the principle of least privilege: run as unprivileged user. | ||
# Running as non-root enables running this image in platforms like OpenShift | ||
# that do not allow images running as root. | ||
# User ID 65534 is usually user 'nobody'. | ||
USER 65534 | ||
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ENTRYPOINT ["dyndnsd", "/etc/dyndnsd/config.yml"] |