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

@@ -72,6 +72,8 @@ RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selectio
         # network
         iputils-ping \
         dnsutils \
+        # init
+        tini \
     
     # chromium (multi-arch compatible - works on both amd64 and arm64)
     && apt-get install -y -q --no-install-recommends chromium-browser \
@@ -135,5 +137,5 @@ ENV DENO_INSTALL="/root/.deno"
 ENV PATH="$DENO_INSTALL/bin:$PATH"
 
 # Set entrypoint to make nvm available in all runtime contexts
-ENTRYPOINT ["/usr/local/bin/docker-entrypoint.sh"]
+ENTRYPOINT ["/usr/bin/tini", "--", "/usr/local/bin/docker-entrypoint.sh"]
 CMD ["bash"]