The base image never starts a service (closes #16)

build.sh and bin/test used to start valkey-server and ping it to prove it runs;
they now check it with valkey-server --version and valkey-cli --version, so the
ping loop, shutdown, and the cleanup of the Valkey run's log files are gone.
/var/log/valkey and /var/log/nginx keep their package owners and modes, and
nginx -t stays. README states that Valkey, PostgreSQL and nginx are installed
but never run. No package install starts a service: invoke-rc.d already denies
every start, and no ENTRYPOINT or CMD starts one.

Model: deepseek-v4-pro

README.md

@@ -140,6 +140,9 @@ exec /usr/local/bin/myapp
 Services should log to stdout/stderr; the container's log is the combined
 output of all services.
 
+The image installs Valkey, PostgreSQL and nginx but never runs them; a child
+image that wants one runs it as a service.
+
 The image sets `CMD ["/usr/local/sbin/runsvinit"]` and no `ENTRYPOINT`, so
 a child image that only needs one unsupervised process can override `CMD`
 and ignore runit entirely, and `docker run -it image bash` works as

bin/test

@@ -34,9 +34,6 @@ docker run --rm "$img" bash -ec '
     bundle --version
     valkey-server --version
     valkey-cli --version
-    valkey-server /etc/valkey/valkey.conf
-    ok=; for i in $(seq 1 50); do if valkey-cli ping 2>/dev/null | grep -q PONG; then ok=1; break; fi; sleep 0.1; done; [ -n "$ok" ]
-    valkey-cli shutdown nosave
     psql --version
     postgres --version
     nginx -t

build.sh

@@ -146,8 +146,8 @@ rm -rf /usr/share/doc /usr/share/man /usr/share/info /usr/share/lintian
 find /usr/share/locale -mindepth 1 -maxdepth 1 ! -name 'en*' ! -name 'locale.alias' -exec rm -rf {} +
 rm -rf /root/.cache /root/.npm /root/.config /root/go /tmp/* /var/tmp/*
 
-# nginx and Valkey open their log files at startup; recreate the log
-# directories the cleanup above removed, with their package owners.
+# Recreate the log directories the cleanup above removed, with their package
+# owners, so child images have them ready without recreating them at startup.
 install -d -o root -g adm /var/log/nginx
 install -d -o valkey -g adm -m 2750 /var/log/valkey
 
@@ -167,9 +167,6 @@ ruby --version
 bundle --version
 valkey-server --version
 valkey-cli --version
-valkey-server /etc/valkey/valkey.conf
-ok=; for i in $(seq 1 50); do if valkey-cli ping 2>/dev/null | grep -q PONG; then ok=1; break; fi; sleep 0.1; done; [ -n "$ok" ]
-valkey-cli shutdown nosave
 psql --version
 postgres --version
 nginx -t
@@ -192,7 +189,5 @@ test -d /etc/service
 
 # The checks above leave caches and log files behind.
 rm -rf /tmp/* /var/tmp/* /root/.cache /root/.npm /root/.config
-rm -f /var/log/valkey/*
 rm -f /var/log/nginx/*
-install -d -o valkey -g adm -m 2750 /var/log/valkey
 rm -f "$0"