feat: add initial minimal example

.github/workflows/build-simple.yml

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+name: bluebuild
+on:
+  push:
+    paths-ignore: # don't rebuild if only documentation has changed
+      - "**.md"
+
+  pull_request:
+  workflow_dispatch: # allow manually triggering builds
+jobs:
+  bluebuild:
+    name: Build Custom Image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+    strategy:
+      fail-fast: false # stop GH from cancelling all matrix builds if one fails
+      matrix:
+        recipe:
+
+          # 00-minimal
+          - folder: ./00-minimal
+            file: recipe.yml
+
+    steps:
+       # the build is fully handled by the reusable github action
+      - name: Build Custom Image
+        uses: blue-build/[email protected]
+        working-directory: ${{ matrix.recipe.folder }} 
+        with:
+          recipe: ${{ matrix.recipe.file }}
+          cosign_private_key: ${{ secrets.SIGNING_SECRET }}
+          registry_token: ${{ github.token }}
+          pr_event_number: ${{ github.event.number }}

00-minimal/README.md

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+# Minimal example
+
+This example showcases how streamlined a very minimal configuration could be by omitting configuration options.
+
+- [recipe.yml](./recipes/recipe.yml)
+- [build.yml](./build.yml)

00-minimal/build.yml

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+../.github/workflows/build-simple.yml

00-minimal/recipes/recipe.yml

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+name: example/minimal
+description: minimal bluebuild example image
+base-image: ghcr.io/ublue-os/kinoite-main
+image-version: latest
+
+modules:
+
+  - type: rpm-ostree
+    install:
+      - micro
+      - zsh
+      - playerctl 
+    remove:
+      - firefox
+      - firefox-langpacks
+
+  - type: default-flatpaks
+    user:
+      install:
+        - org.mozilla.firefox
+        - org.kde.krita
+        - com.discordapp.Discord
+
+  - type: signing