ci(docker): init docker files

Dockerfile

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+FROM public.ecr.aws/docker/library/golang:1.23.4-bookworm AS build
+
+# Set destination for COPY
+WORKDIR /app
+
+# Download Go modules
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target="/go" go mod download -x
+
+COPY . .
+
+# Build
+ENV GOCACHE=/root/.cache/go-build
+RUN --mount=type=cache,target="/go" --mount=type=cache,target="/root/.cache/go-build" CGO_ENABLED=1 GOOS=linux go build -o /flink-kube-operator ./cmd/operator
+
+
+FROM busybox:1.36.1 AS final
+
+
+COPY --from=build /flink-kube-operator /flink-kube-operator
+
+EXPOSE 8083
+
+# Run
+CMD ["/flink-kube-operator"]

Dockerfile.flink

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+FROM public.ecr.aws/docker/library/flink:1.20.0-scala_2.12-java17
+
+# Set working directory
+WORKDIR /opt/flink
+
+# Set environment variables for Flink mini-cluster
+ENV FLINK_HOME /opt/flink
+ENV PATH=$FLINK_HOME/bin:$PATH
+
+# Expose necessary ports for the Flink UI (JobManager) and job manager
+EXPOSE 8081 6123
+
+# Command to start Flink JobManager and TaskManager in a mini-cluster setup
+CMD ["bin/start-cluster.sh"]