cleanup: rewrite collapse script in go w/ concurrency

Author: densumesh

docker/collapse-query-script/Dockerfile

@@ -1,15 +1,44 @@
-# Use an official Python runtime as a parent image
-FROM python:3.9-slim
+# Start with a small base image
+FROM golang:1.24-alpine AS builder
 
-# Set the working directory in the container
+# Install git and build essentials
+RUN apk add --no-cache git gcc musl-dev
+
+# Set working directory
 WORKDIR /app
 
-COPY requirements.txt /app/requirements.txt
-# Install any needed packages specified in requirements.txt
-RUN pip install --no-cache-dir -r requirements.txt
+# Copy go.mod and go.sum first to leverage Docker cache
+COPY go.mod go.sum* ./
+
+# Download dependencies (if go.sum exists)
+RUN if [ -f go.sum ]; then go mod download; else go mod tidy; fi
+
+# Copy source code
+COPY *.go ./
+
+# Build the application with optimizations
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags="-s -w" -o collapse_queries .
+
+# Use a minimal alpine image for the final container
+FROM alpine:3.18
+
+# Add CA certificates for HTTPS
+RUN apk --no-cache add ca-certificates tzdata
+
+# Set working directory
+WORKDIR /app
+
+# Copy the binary from the builder stage
+COPY --from=builder /app/collapse_queries .
+
+# Copy the .env file if it exists (optional, can be mounted)
+COPY .env* ./
+
+# Create a non-root user and set permissions
+RUN adduser -D -H -h /app appuser && \
+    chown -R appuser:appuser /app
 
-# Copy the current directory contents into the container at /app
-COPY collapse_queries.py /app/collapse_queries.py
+USER appuser
 
-# Run script.py when the container launches
-CMD ["python", "collapse_queries.py"]
+# Command to run the application
+ENTRYPOINT ["/app/collapse_queries"]