refactor: move stack assets and wire in mailhog

ToolboxStack/output/toolbox-base/docker-compose.yml

@@ -0,0 +1,20 @@
+services:
+  toolbox-base:
+    container_name: tsysdevstack-toolboxstack-toolbox-base
+    image: tsysdevstack-toolboxstack-toolbox-base
+    build:
+      context: .
+      args:
+        USER_ID: ${LOCAL_UID:-1000}
+        GROUP_ID: ${LOCAL_GID:-1000}
+        USERNAME: ${LOCAL_USERNAME:-toolbox}
+    user: "${LOCAL_UID:-1000}:${LOCAL_GID:-1000}"
+    working_dir: /workspace
+    command: ["sleep", "infinity"]
+    init: true
+    tty: true
+    stdin_open: true
+    volumes:
+      - .:/workspace:rw
+      - ${HOME}/.local/share/mise:/home/toolbox/.local/share/mise:rw
+      - ${HOME}/.cache/mise:/home/toolbox/.cache/mise:rw