Add week 2 materials

materials/02-communication/grpc-practice/go-server/Dockerfile

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+# Dockerfile was generated from
+# https://github.com/lodthe/dockerfiles/blob/main/go/Dockerfile
+
+FROM golang:1.21-alpine3.19 AS builder
+
+# Setup base software for building an app.
+RUN apk update && apk add ca-certificates git gcc g++ libc-dev binutils
+
+WORKDIR /opt
+
+# Download dependencies.
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+
+# Copy application source.
+COPY . .
+
+# Build the application.
+RUN go build -o bin/application .
+
+# Prepare executor image.
+FROM alpine:3.19 AS runner
+
+RUN apk update && apk add ca-certificates libc6-compat openssh bash && rm -rf /var/cache/apk/*
+
+WORKDIR /opt
+
+COPY --from=builder /opt/bin/application ./
+
+# Add required static files.
+#COPY assets assets
+
+# Run the application.
+CMD ["./application"]