feat: initialize golang project template with docker and ci/cd

Dockerfile

@@ -0,0 +1,29 @@
+# Build stage
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /app
+
+# Copy go.mod and go.sum first to leverage Docker cache
+# We need to check if go.sum exists, but COPY fails if it doesn't. 
+# Since we just ran go mod init, go.sum might not exist yet if no deps.
+# SAFE PATTERN: COPY go.mod and optional go.sum
+COPY go.mod go.sum* ./
+RUN go mod download
+
+# Copy the rest of the source code
+COPY . .
+
+# Build the application
+# -ldflags="-w -s" strips debug information for smaller binary
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /go/bin/app ./cmd/app
+
+# Final stage
+# Use distroless static image for security and minimal footprint
+FROM gcr.io/distroless/static-debian12:nonroot
+
+WORKDIR /
+
+COPY --from=builder /go/bin/app /app
+USER nonroot:nonroot
+
+ENTRYPOINT ["/app"]