add source code from local folder

Caddyfile

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+:80 {
+	reverse_proxy {
+		to HOSTS
+		lb_policy round_robin
+	}
+}

Dockerfile

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+FROM caddy:2-alpine
+WORKDIR /app
+
+COPY Caddyfile .
+COPY generateCaddyfile.sh .
+
+CMD ["./generateCaddyfile.sh"]

README.md

@@ -1,2 +1,12 @@
 # CaddyBalancer
- A Docker image for load balancing based on Caddy
+
+A Docker image for load balancing based on Caddy
+
+## Usage
+
+```bash
+docker run -d \
+    -p 8080:80 \
+    -e UPSTREAMS="http://12.34.56.78:9999,http://98.76.54.32:1111" \
+    docker.pkg.github.com/simonprinz/caddybalancer/caddybalancer:latest
+```

generateCaddyfile.sh

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+#!/bin/sh
+
+# generate Caddyfile
+hosts=`echo "$UPSTREAMS" | sed "s|,|\\\\\\n\\t\\tto |"`
+sed -i "s|HOSTS|$hosts|" Caddyfile
+cat Caddyfile
+
+# run caddy
+caddy run --config /app/Caddyfile --adapter caddyfile