Modify our Dockerfile to be like in gitpod/workspace

Source: https://github.com/gitpod-io/workspace-images/blob/master/base/Dockerfile

tests/ubuntu/Dockerfile

@@ -1,7 +1,62 @@
-FROM ubuntu:20.04
+# The main ubuntu image is so fucking large, DO NOT DO THAT AT HOME! Instead, we'll writing this Dockerfile
+# based on https://github.com/gitpod-io/workspace-images/blob/master/base/Dockerfile, minus all the BS we don't
+# really need in an real machine.
+FROM buildpack-deps:focal
 
 # Start our way out as root first
 USER root
 
-# TODO: Create an user with sudo prvilleges and with hardocded UID/GUID
-RUN useradd gildedguy
+# Reserved if you building from source
+ARG DOCKER_UID=1000
+
+# Copy our scripts to their destinations
+COPY ../common/bin/logger.sh /usr/bin/entrypoint.sh
+COPY ./bin/install-packages /usr/bin/install-packages
+
+# Install deps in noninteractive mode.
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN yes | unminimize \
+    && install-packages \
+        zip \
+        unzip \
+        bash-completion \
+        build-essential \
+        ninja-build \
+        htop \
+        jq \
+        less \
+        locales \
+        man-db \
+        nano \
+        ripgrep \
+        software-properties-common \
+        sudo \
+        time \
+        multitail \
+        lsof \
+        ssl-cert \
+        zsh \
+    && locale-gen en_US.UTF-8
+
+ENV LANG=en_US.UTF-8
+
+### Git ###
+RUN add-apt-repository -y ppa:git-core/ppa \
+    && install-packages git git-lfs
+
+### Our dummy UNIX user, in which case, we're gonna use my usual Ubuntu user ###
+# '-l': see https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#user
+RUN useradd -l -u $DOCKER_UID -G sudo -md /home/gildedguy -s /bin/bash -p gildedguy gildedguy \
+    # passwordless sudo for users in the 'sudo' group
+    && sed -i.bkp -e 's/%sudo\s\+ALL=(ALL\(:ALL\)\?)\s\+ALL/%sudo ALL=NOPASSWD:ALL/g' /etc/sudoers
+
+### Our dummy UNIX user, in which case, we're gonna use my usual Ubuntu user (2) ###
+USER gildedguy
+
+# use sudo so that we don't get sudo usage info on (the first) login
+# also I misspelled Gildedguy's name for memes lol
+RUN sudo echo "Running 'sudo' for Guildedguy: success
+
+# configure git-lfs
+RUN sudo git lfs install --system