feat: provide minimal ubuntu system

ubuntu.yaml

@@ -1,10 +1,68 @@
 track: "https://git.ruds.io/rs2009/blendOS-tracks/raw/branch/main/oci.yaml"
 
+modules:
+  - name: apt-install
+    run: |
+      apt-get update
+      DEBIAN_FRONTEND=noninteractive apt-get install -yq "$@"
+
+  - name: apt-remove
+    run: |
+      DEBIAN_FRONTEND=noninteractive apt-get autoremove --purge -yq "$@"
+
 stages:
   - module: exec
     inputs:
-      - apt-get update
-      - apt-get install -yq hello
+      - |
+        mkdir -p /etc/apt/apt.conf.d /var/cache/blendOS/ubuntu/apt
+        cat >/etc/apt/apt.conf.d/10blendOS.conf <<'EOF'
+        Dir::Cache::Archives /var/cache/blendOS/ubuntu/apt;
+        EOF
+
+  - module: apt-install
+    inputs:
+      - python3
+      - python3-click
+      - python3-requests
+      - python3-fasteners
+      - umoci
+      - skopeo
+      - jq
+      - git
+      - pacman
+      - linux-generic
+      - systemd
+      - systemd-container
+      - locales
+      - grub2-common
+      - ubuntu-standard
+      - dracut
+
+  - module: exec
+    inputs:
+      - |
+        git clone --revision 3c07cd05b998f0a5029ca4afa6e01ff21426b0a1 --depth 1 https://git.ruds.io/rs2009/akshara /akshara
+        cd /akshara
+        cp -a usr/lib/akshara /usr/lib/akshara
+        cp -a usr/lib/dracut/modules.d/10akshara /usr/lib/dracut/modules.d/10akshara
+        cp usr/bin/akshara /usr/bin/akshara
+      - rm -rf /akshara
+
+override:
+  - path: /var/lib/dpkg/
+    keep: new
+
+  - path: /var/lib/apt/
+    keep: new
+
+  - path: /etc/apt/sources.list
+    keep: new
+
+  - path: /etc/apt/sources.list.d/
+    keep: new
+
+  - path: /var/cache/blendOS/
+    keep: old
 
 env:
   IMAGE_NAME: docker://docker.io/library/ubuntu:rolling