Use tini as init in all containers

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

docker/Dockerfile.base.rocky

@@ -46,6 +46,12 @@ RUN dnf install 'dnf-command(config-manager)' -y && \
        python3-pip && \
     pip3 install --ignore-installed pyyaml
 
+# 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
+
 #create the WORKDIR
 WORKDIR /oai-ran
 COPY . .