added dockerfile for nakama

Dockerfile

@@ -0,0 +1,44 @@
+# -----------------------------------------------------
+# 1. Build the Nakama plugin (ARM64)
+# -----------------------------------------------------
+FROM --platform=linux/arm64 golang:1.22-alpine AS plugin_builder
+
+# Install dependencies needed for CGO plugin build
+RUN apk add --no-cache git build-base
+
+WORKDIR /workspace
+
+# Download module deps first (better caching)
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build plugin
+RUN mkdir -p build && \
+    CGO_ENABLED=1 go build \
+        --trimpath \
+        --buildmode=plugin \
+        -o build/main.so \
+        ./plugins
+
+
+# -----------------------------------------------------
+# 2. Build final Nakama image (ARM64)
+# -----------------------------------------------------
+FROM --platform=linux/arm64 heroiclabs/nakama:3.21.0 AS nakama
+
+# Copy plugin from builder stage
+COPY --from=plugin_builder /workspace/build/main.so /nakama/data/modules/main.so
+
+# Copy Nakama config
+COPY local.yml /nakama/data/local.yml
+
+# Default Nakama startup (runs migrations + server)
+ENTRYPOINT [
+  "/bin/sh",
+  "-ecx",
+  "/nakama/nakama migrate up --database.address postgres:localdb@postgres:5432/nakama?sslmode=disable && \
+   exec /nakama/nakama --config /nakama/data/local.yml --database.address postgres:localdb@postgres:5432/nakama?sslmode=disable"
+]