feat: add docker files

adds compose.yml, Dockerfile and entrypoint.sh for running the backend inside of docker

entrypoint.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+if [ ! -d "/gorb/config" ]; then
+    mkdir /gorb/config
+fi
+
+if [ ! -d "/gorb/logs" ]; then
+    mkdir /gorb/logs
+fi
+
+if [ ! -f "/gorb/config/config.toml" ]; then
+cat > /gorb/config/config.toml <<EOF
+[database]
+username = "${DATABASE_USERNAME}"
+password = "${DATABASE_PASSWORD}"
+database = "${DATABASE}"
+host = "${DATABASE_HOST}"
+port = ${DATABASE_PORT}
+EOF
+fi
+
+rotate_log() {
+  LOGFILE="$1"
+  BASENAME=$(basename "$LOGFILE" .log)
+  DIRNAME=$(dirname "$LOGFILE")
+
+  if [ -f "$LOGFILE" ]; then
+    # Find the next available number
+    i=1
+    while [ -f "$DIRNAME/${BASENAME}.${i}.log.gz" ]; do
+      i=$((i + 1))
+    done
+
+    gzip "$LOGFILE"
+    mv "${LOGFILE}.gz" "$DIRNAME/${BASENAME}.${i}.log.gz"
+  fi
+}
+
+rotate_log "/gorb/logs/stdout.log"
+rotate_log "/gorb/logs/stderr.log"
+
+/usr/bin/gorb-backend --config /gorb/config/config.toml  > /gorb/logs/stdout.log 2> /gorb/logs/stderr.log