docs: add comments to Dockerfile explaining gcompat and Swift runtime additions

Co-authored-by: commjoen <1457214+commjoen@users.noreply.github.com>
Agent-Logs-Url: https://github.com/OWASP/wrongsecrets/sessions/f5d8b194-44cb-4526-810c-61f4231b6b47

Author: Copilot

Dockerfile

@@ -33,8 +33,9 @@ RUN echo "2vars"
 RUN echo "$ARG_BASED_PASSWORD"
 RUN echo "$argBasedPassword"
 
-RUN apk add --no-cache libstdc++ icu-libs gcompat
+RUN apk add --no-cache libstdc++ icu-libs gcompat  # gcompat provides glibc ELF interpreter compat for glibc-linked Swift binaries
 
+# Copy Swift runtime libraries needed by the wrongsecrets-swift binary
 RUN mkdir -p /usr/lib/swift/linux
 COPY --from=swift-runtime /usr/lib/swift/linux/libswiftCore.so /usr/lib/swift/linux/
 COPY --from=swift-runtime /usr/lib/swift/linux/libswift_Concurrency.so /usr/lib/swift/linux/