initial commit with basic level 0 on single machine

Dockerfile

@@ -0,0 +1,20 @@
+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+ARG levelNum=0
+
+RUN <<EOF
+useradd -m -s /bin/bash player${levelNum}
+echo 'root:superSecretRootPassword' | chpasswd
+echo "player${levelNum}:superSecretPlayerPassword${levelNum}" | chpasswd
+
+EOF
+
+COPY ./levels/level${levelNum} /home/player$levelNum
+
+USER player${levelNum}
+
+WORKDIR /home/player$levelNum
+
+CMD /bin/bash

compose.yaml

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+services:
+  ubuntu:
+    build: .
+    hostname: uactf
+    command: ["tail", "-f", "/dev/null"]
+    restart: unless-stopped

levels/level0/readme.txt

@@ -0,0 +1 @@
+{f14g}