Use tini as init in all containers

- Print problems, e.g., segfault
- Handle signals and zombie processes properly

docker/Dockerfile.base.rhel9

@@ -58,6 +58,12 @@ RUN rm -f /etc/rhsm-host && \
     echo "/usr/local/lib" > /etc/ld.so.conf.d/local-lib.conf && \
     echo "/usr/local/lib64" >> /etc/ld.so.conf.d/local-lib.conf
 
+# Add "Tini - A tiny but valid init for containers", https://github.com/krallin/tini
+# it will be copied into target containers, to print exit numbers and handle signals properly
+ENV TINI_VERSION v0.19.0
+ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini /tini
+RUN chmod +x /tini
+
 # In some network environments, GIT proxy is required
 RUN /bin/bash -c "if [[ -v NEEDED_GIT_PROXY ]]; then git config --global http.proxy $NEEDED_GIT_PROXY; fi"