feat(ci): replace npmci with szci across CI and images; add szci preinstalled images and make tini the PID 1 init in Docker images

Dockerfile_alpine-node

@@ -22,7 +22,8 @@ RUN apk add --no-cache \
     unzip \
     iputils \
     bind-tools \
-    libstdc++
+    libstdc++ \
+    tini
 
 # Install NVM (latest version for better Alpine/musl support)
 RUN mkdir -p $NVM_DIR && curl https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash
@@ -69,5 +70,5 @@ ENV NODE_PATH=$NVM_DIR/v$NODE_VERSION_LTS/lib/node_modules
 ENV PATH=$NVM_DIR/versions/node/v$NODE_VERSION_LTS/bin:$PATH
 
 # Set entrypoint to make nvm available in all runtime contexts
-ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
+ENTRYPOINT ["/sbin/tini", "--", "/usr/local/bin/docker-entrypoint.sh"]
 CMD ["bash"]