Add Docker support

.dockerignore

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+Dockerfile
+docker-compose.yml
+.gitignore
+README.md
+config.toml

Dockerfile

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+FROM golang:1.21-alpine
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY *.go ./
+RUN go build -o hardfiles main.go
+RUN mkdir files
+CMD ["./hardfiles"]

docker-compose.yml

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+services:
+  hardfiles:
+    container_name: hardfiles
+    build: .
+    volumes:
+      - "$PWD/files:/app/files"
+      - "$PWD/www:/app/www"
+      - "$PWD/config.toml:/app/config.toml"
+    ports:
+      - "5000:5000"