add agate docker config

agate/Dockerfile

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+FROM rust:latest
+
+RUN cargo install agate
+
+WORKDIR /var/agate
+
+ENTRYPOINT ["agate"]

agate/README.md

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+# Agate
+
+[Agate](https://github.com/mbrubeck/agate) is a simple Gemini server for static files.
+
+This folder holds the Docker config that I use to manage my Agate server and serve my Capsule.

agate/docker-compose.yaml

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+version: "3.9"
+services:
+  agate:
+    restart: always
+    build: .
+    container_name: agate
+    volumes:
+      - ./content:/var/agate/content
+      - ./certs:/var/agate/certs
+    ports:
+      - "1965:1965"
+    command: --content content --certs certs --addr 0.0.0.0:1965 --hostname gmi.runtimeterror.dev --hostname capsule.jbowdre.lol --lang en-US