chore: Create base integration test setup (#55)

This will allow us to create a suite of tests for our new features
rather than using my personal image repo

integration-tests/Earthfile

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+VERSION 0.8
+PROJECT blue-build/cli
+
+all:
+	ARG NIGHTLY=false
+	BUILD +build-template --NIGHTLY=$NIGHTLY
+	BUILD +build --NIGHTLY=$NIGHTLY
+	BUILD +rebase --NIGHTLY=$NIGHTLY
+	BUILD +upgrade --NIGHTLY=$NIGHTLY
+
+build-template:
+	ARG NIGHTLY=false
+	FROM DOCKERFILE \
+		-f +template-containerfile/test/Containerfile \
+		+template-containerfile/test/* --NIGHTLY=$NIGHTLY
+	RUN [ -f /usr/test-file ]
+
+template-containerfile:
+	ARG NIGHTLY=false
+	FROM +test-base --NIGHTLY=$NIGHTLY
+	RUN bluebuild -vv template config/recipe.yml | tee Containerfile
+
+	SAVE ARTIFACT /test
+
+build:
+	ARG NIGHTLY=false
+	FROM +test-base --NIGHTLY=$NIGHTLY
+
+	RUN --privileged bluebuild -vv build config/recipe.yml
+
+rebase:
+	ARG NIGHTLY=false
+	FROM +test-base --NIGHTLY=$NIGHTLY
+
+	RUN --privileged bluebuild -vv rebase config/recipe.yml
+
+upgrade:
+	ARG NIGHTLY=false
+	FROM +test-base --NIGHTLY=$NIGHTLY
+	RUN mkdir -p /etc/bluebuild && touch /etc/bluebuild/template.tar.gz
+
+	RUN --privileged bluebuild -vv upgrade config/recipe.yml
+
+test-base:
+	ARG NIGHTLY=false
+
+	FROM ../+blue-build-cli-alpine --NIGHTLY=$NIGHTLY
+
+	COPY ./mock-scripts/ /usr/bin/
+
+	WORKDIR /test
+	COPY ./test-repo /test
+
+	# Setup a cosign key pair
+	RUN echo -n "\n\n" | cosign generate-key-pair
+	ENV COSIGN_PRIVATE_KEY=$(cat cosign.key)
+	RUN rm cosign.key

integration-tests/mock-scripts/buildah

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+#!/bin/sh
+
+echo 'Running buildah'

integration-tests/mock-scripts/podman

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+#!/bin/sh
+
+echo 'Running podman'

integration-tests/mock-scripts/rpm-ostree

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+#!/bin/sh
+
+echo 'Running rpm-ostree'

integration-tests/test-repo/config/files/usr/test-file

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+

integration-tests/test-repo/config/recipe.yml

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+# image will be published to ghcr.io/<user>/<name>
+name: template
+# description will be included in the image's metadata
+description: This is my personal OS image.
+
+# the base image to build on top of (FROM) and the version tag to use
+base-image: ghcr.io/ublue-os/silverblue-main
+image-version: 39 # latest is also supported if you want new updates ASAP
+
+# module configuration, executed in order
+# you can include multiple instances of the same module
+modules:
+  - type: files
+    files:
+      - usr: /usr # copies config/files/usr into your image's /usr.
+                  # put configuration files you want in /etc/ on a booted system 
+                  # in /usr/etc/ in the image. read more in files module reference.
+
+  - type: script
+    scripts:
+      - example.sh
+
+  - type: rpm-ostree
+    repos:
+      - https://copr.fedorainfracloud.org/coprs/atim/starship/repo/fedora-%OS_VERSION%/atim-starship-fedora-%OS_VERSION%.repo
+    install:
+      - micro
+      - starship
+    remove:
+      - firefox # default firefox removed in favor of flatpak
+      - firefox-langpacks # langpacks needs to also be removed to prevent dependency problems
+
+  - type: default-flatpaks
+    notify: true # Send notification after install/uninstall is finished (true/false)
+    system:
+      # If no repo information is specified, Flathub will be used by default
+      # repo-url: https://dl.flathub.org/repo/flathub.flatpakrepo
+      # repo-name: flathub
+      # repo-title: "Flathub (system-wide)" # Optional; this sets the remote's user-facing name in graphical frontends like GNOME Software
+      install:
+        - org.mozilla.firefox
+        - org.gnome.Loupe
+        - one.ablaze.floorp//lightning # This is an example of flatpak which has multiple branches in selection (flatpak//branch).
+      # Flatpak runtimes are not supported (like org.winehq.Wine//stable-23.08),
+      # only normal flatpak applications are (like Floorp Lightning web browser in this example).
+      # Installing different branches of the same Flatpak is not supported.
+      remove:
+        - org.gnome.eog
+
+  - type: signing # this sets up the proper policy & signing files for signed images to work fully
+  - type: test-module
+

integration-tests/test-repo/config/scripts/example.sh

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+#!/usr/bin/env bash
+
+# Tell this script to exit if there are any errors.
+# You should have this in every custom script, to ensure that your completed
+# builds actually ran successfully without any errors!
+set -oue pipefail
+
+# Your code goes here.
+echo 'This is an example shell script'
+echo 'Scripts here will run during build if specified in recipe.yml'

integration-tests/test-repo/modules/test-module/test-module.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+echo "This is a test module"