CTAO Science Portal: static Astro site with git-based CMS (Sveltia + Gitea)

Portal code only; editorial content lives in the ctao/content repo on the
demo machine's Gitea and is overlaid at build time (see README.md and
deploy/README.md). Live demo: https://astro.isl-dev.grid.cyfronet.pl

deploy/ctao-portal-build.timer

@@ -0,0 +1,18 @@
+# CTAO portal demo — poll cadence for the build worker.
+# OnUnitInactiveSec: next tick 10 s after the previous run FINISHES (it is
+# deactivation-relative; OnUnitActiveSec would be start-relative). Overlap is
+# impossible either way — a timer never activates a still-running unit.
+# OnActiveSec covers `systemctl --user enable --now` (first tick 5 s later);
+# OnBootSec covers reboot. Enable: systemctl --user enable --now ctao-portal-build.timer
+
+[Unit]
+Description=CTAO portal demo — poll the code and content repos every 10 s
+
+[Timer]
+OnActiveSec=5
+OnBootSec=30
+OnUnitInactiveSec=10
+AccuracySec=1s
+
+[Install]
+WantedBy=timers.target