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diff --git a/foobar/portable/ci/docker/Dockerfile.ubuntu-gcc10 b/foobar/portable/ci/docker/Dockerfile.ubuntu-gcc10
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+FROM ubuntu:latest
+
+# Allow container to expose ports at runtime, if necessary
+# https://docs.docker.com/engine/reference/#expose
+EXPOSE 25
+EXPOSE 465
+EXPOSE 587
+
+# creates /opensmtpd dir and makes all following commands to run in it
+# https://docs.docker.com/engine/reference/builder/#workdir
+WORKDIR /opensmtpd
+
+# install necessary packages
+RUN apt update \
+  && apt install -y --no-install-recommends \
+  autoconf \
+  automake \
+  bison \
+  build-essential \
+  libevent-dev \
+  libssl-dev \
+  libtool \ 
+  libpam0g-dev \
+  zlib1g-dev \
+  gcc-10
+
+# create users and directories
+RUN mkdir -p /var/lib/opensmtpd/empty \
+  && useradd _smtpd \
+      --home-dir /var/lib/opensmtpd/empty \
+      --no-create-home \
+      --shell /bin/false \
+   && useradd _smtpq \
+      --home-dir /var/lib/opensmtpd/empty \
+      --no-create-home \
+      --shell /bin/false \
+   && mkdir -p /var/spool/smtpd \
+   && mkdir -p /var/mail \
+   && mkdir -p /etc/mail \
+   && chmod 711 /var/spool/smtpd
+
+# Copy contentes of the repo inside the container
+# https://docs.docker.com/engine/reference/builder/#copy
+COPY . /opensmtpd
+
+RUN export CC=gcc-10 CXX=g++-10 
+RUN ./bootstrap \
+  && ./configure \
+       --with-gnu-ld \
+       --sysconfdir=/etc/mail \
+       --with-auth-pam \
+  && make \
+  && make install \
+  && cp etc/aliases /etc/mail/aliases