Add container build

.containerignore

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+# container build
+container/
+
+# from .gitignore
+.auto
+.deps
+.dirstamp
+Makefile
+Makefile.in
+stamp-*
+aclocal.m4
+autom4te.cache
+config.h
+config.h.in
+config.log
+config.status
+configure
+
+*.o
+rinetd
+rinetd.exe
+
+*.vcxproj.user
+Debug
+Release

container/Dockerfile

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+# registry.access.redhat.com/ubi9/ubi:latest
+FROM docker.io/redhat/ubi9:latest AS builder
+
+RUN set -x \
+    && dnf upgrade -y \
+    # Install OS dependencies
+    && dnf install -y \
+        # C compiler, make and related tools
+        gcc \
+        make \
+        cmake \
+        automake
+
+# Copy source to /build/
+COPY . /build/
+
+WORKDIR /build/
+RUN set -x \
+    # Build
+    && ./bootstrap \
+    && ./configure \
+    && make \
+    # Install
+    && cd /build/ \
+    && make install
+
+# ==========================
+# Final image
+FROM docker.io/redhat/ubi9:latest
+
+RUN set -x \
+    && dnf upgrade -y \
+    && dnf clean all
+
+COPY --from=builder /usr/local/sbin/rinetd /usr/local/sbin/rinetd

container/rinetd.conf

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+#
+# forwarding rules come here
+#
+# you may specify allow and deny rules after a specific forwarding rule
+# to apply to only that forwarding rule
+#
+# bindadress    bindport  connectaddress  connectport
+0.0.0.0 8080 localhost 9000
+
+# logging information
+logfile /var/log/rinetd.log
+
+# uncomment the following line if you want web-server style logfile format
+# logcommon