04-rwslotmachine4: Add Dockerfile

Signed-off-by: Amalia Ionescu <ionescu.amalia98@gmail.com>

Author: AmaliaI12

chapters/mitigations-and-defensive-strategies/defense-mechanisms/activities/04-rwslotmachine4/sol/Dockerfile

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+# Stage 1: Build
+FROM ubuntu:22.04 AS builder
+
+WORKDIR /app
+
+RUN set -xe; \
+    apt-get -yqq update; \
+    apt-get -yqq install build-essential \
+    ;
+
+COPY ./rwslotmachine4.c .
+COPY ./Makefile .
+
+RUN make
+
+# Stage 2: Runtime
+FROM ubuntu:22.04
+
+RUN set -xe; \
+     apt-get -yqq update;\
+     apt-get -yqq install libstdc++6; \
+     rm -rf /var/lib/apt/lists/* \
+;
+
+WORKDIR /app
+
+# Copy compiled binary from builder stage
+COPY --from=builder /app/rwslotmachine4 .
+
+# Expose port
+EXPOSE 31347
+
+# Run the executable
+CMD ["/app/rwslotmachine4"]

chapters/mitigations-and-defensive-strategies/defense-mechanisms/activities/04-rwslotmachine4/sol/Makefile

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+TARGET = rwslotmachine4
+
+all: $(TARGET)
+
+$(TARGET): rwslotmachine4.c
+	gcc -o $(TARGET) rwslotmachine4.c
+
+clean:
+	rm -f $(TARGET)
+
+.PHONY: all clean

chapters/mitigations-and-defensive-strategies/defense-mechanisms/activities/04-rwslotmachine4/sol/README.md

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+# Building and Running
+
+1. Build the Docker image:
+```bash
+docker build -t rwslotmachine4 -f Dockerfile .
+```
+
+2. Run a Docker instance from the Docker image:
+```bash
+docker run -d --rm -p 31347:31337 --name rwslotmachine4-cnt -t rwslotmachine4
+```