Add compose and README

README.md

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+dockup
+---
+
+# Quick start
+Get the provided `compose.yaml`.
+```bash
+docker compose up -d
+```
+
+# Dependencies
+This program needs [regctl](https://github.com/regclient/regclient.git).
+It is shipped with container image by default.
+
+# Configuration
+Configuration options are available via environment variables:
+- `DOCKUP_INTERVAL`: Time between refreshes (30 min by default)
+- `DOCKUP_PORT`: Change default port - Do not set this option when running via Docker (Defaults to 8000)

compose.yaml

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+---
+name: dockup
+services:
+  dockup:
+    image: registry.gitlab.com/ramiuslr/dockup:latest
+    container_name: dockup
+    restart: always
+    ports:
+      - 8000:8000
+    environment:
+      DOCKUP_INTERVAL: 5 # Defaults to 30
+...