add docker support

.dockerignore

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+node_modules
+npm-debug.log
+.env
+Dockerfile
+.dockerignore

Dockerfile

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+FROM node:21-bookworm-slim
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+
+CMD [ "node", "main.js" ]

docker-compose.yml

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+version: '3'
+services:
+    app:
+        image: host/mastodon-to-bluesky:latest
+        container_name: mastodon-to-bluesky
+        environment:
+            MASTODON_INSTANCE: 'https://mastodon.instance'
+            MASTODON_USER: 'username'
+            BLUESKY_ENDPOINT: 'https://bsky.social'
+            BLUESKY_HANDLE: 'USERNAME.bsky.social'
+            BLUESKY_PASSWORD: 'PASSWORD'
+            INTERVAL_MINUTES: 5
+        volumes:
+            - mastodon-to-bluesky:/usr/src/app/data
+        restart: unless-stopped
+
+volumes:
+  mastodon-to-bluesky:
+    external: true