# Use official Go image as build environment
FROM golang:1.24-alpine AS builder

# Set working directory inside the container
WORKDIR /app

# Copy go.mod and go.sum first (for caching dependencies)
COPY go.mod go.sum ./

# Download dependencies (cached if no changes)
RUN go mod download

# Copy the rest of the source code
COPY . .

# Build the Go app statically linked for Alpine
RUN CGO_ENABLED=0 GOOS=linux go build -o main

# Start a new minimal image to run the app
FROM alpine:latest

# Install ca-certificates for HTTPS calls (if needed)
RUN apk --no-cache add ca-certificates

# Copy the binary from builder
COPY --from=builder /app/main /main

# Expose port your app listens on
EXPOSE 8080

# Run the binary
CMD ["./main"]