feat: replace Python Dockerfile with Go multi-stage build

- Convert from Python 3.10 Flask app to Go 1.21 Alpine build
- Add multi-stage Docker build for optimized production image
- Create non-root user for security
- Update health check for new port 8080
- Add comprehensive .dockerignore for Go project

Dockerfile

@@ -1,53 +1,52 @@
-FROM python:3.10-slim AS builder
-
-ENV PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1 \
-    PIP_NO_CACHE_DIR=1
+# Build stage
+FROM golang:1.21-alpine AS builder
 
+# Set working directory
 WORKDIR /app
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    build-essential gcc \
- && rm -rf /var/lib/apt/lists/*
+# Install git (needed for some Go modules)
+RUN apk add --no-cache git
 
-COPY requirements.txt .
+# Copy go mod files
+COPY go.mod go.sum ./
 
-RUN python -m pip install --upgrade pip && \
-    pip wheel --no-deps -r requirements.txt -w /wheels && \
-    pip wheel --no-deps gunicorn -w /wheels
+# Download dependencies
+RUN go mod download
 
-FROM python:3.10-slim AS runtime
+# Copy source code
+COPY . .
 
-ENV PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1 \
-    PIP_NO_CACHE_DIR=1 \
-    PORT=5000 \
-    WSGI_MODULE=server:app \
-    GUNICORN_WORKERS=2 \
-    GUNICORN_THREADS=4 \
-    GUNICORN_TIMEOUT=60 \
-    FLASK_APP=server.py
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o rideaware-api .
 
-WORKDIR /app
+# Production stage
+FROM alpine:latest
 
-RUN groupadd -g 10001 app && useradd -m -u 10001 -g app app
+# Install ca-certificates for HTTPS requests and timezone data
+RUN apk --no-cache add ca-certificates tzdata
 
-COPY --from=builder /wheels /wheels
-RUN pip install --no-cache-dir /wheels/* && rm -rf /wheels
+# Create non-root user
+RUN addgroup -g 1001 -S appgroup && \
+    adduser -u 1001 -S appuser -G appgroup
 
-# Install python-dotenv if not already in requirements.txt
-RUN pip install python-dotenv
+# Set working directory
+WORKDIR /home/appuser
 
-USER app
+# Copy binary from builder stage
+COPY --from=builder /app/rideaware-api .
 
-COPY --chown=app:app . .
+# Change ownership to non-root user
+RUN chown -R appuser:appgroup /home/appuser
 
-# Copy .env file specifically
-COPY --chown=app:app .env .env
+# Switch to non-root user
+USER appuser
 
-EXPOSE 5000
+# Expose port
+EXPOSE 8080
 
-HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
-  CMD python -c "import os,socket; s=socket.socket(); s.settimeout(2); s.connect(('127.0.0.1', int(os.getenv('PORT', '5000')))); s.close()"
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
 
-CMD ["sh", "-c", "exec gunicorn $WSGI_MODULE --bind=0.0.0.0:$PORT --workers=$GUNICORN_WORKERS --threads=$GUNICORN_THREADS --timeout=$GUNICORN_TIMEOUT --access-logfile=- --error-logfile=- --keep-alive=5"]
+# Run the application
+CMD ["./rideaware-api"]