Document how to add and release a blog post

docs/blog-workflow.md: frontmatter/voice conventions, the draft+pubDate gate,
the daily deploy cron, publish checklists (scheduled vs immediate), and gotchas.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/blog-workflow.md

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+# Writing and releasing a blog post
+
+How posts live, how they're scheduled, and how they go live. The short version:
+**a post is public when it is `draft: false` *and* its `pubDate` has arrived** —
+and a daily job rebuilds the site so "arrived" keeps advancing on its own.
+
+## 1. Add the post
+
+Create a Markdown file in `src/content/blog/`, e.g.
+`src/content/blog/my-post.md`. The filename (minus `.md`) is the URL slug:
+`/blog/my-post/`.
+
+Frontmatter is validated at build time against `src/content.config.ts`:
+
+```markdown
+---
+title: Short, specific title
+description: >-
+  One or two sentences. Shown in listings, the RSS feed, and social previews.
+pubDate: 2026-07-08          # ISO date. The publish gate (see below).
+# updatedDate: 2026-07-10    # optional; shown as "updated"
+tags: [android, calendula]   # see the tag vocabulary below
+draft: true                  # true = never public; flip to false when ready
+---
+
+Body in Markdown. ~80-char wrapped to match the other posts.
+```
+
+Voice conventions (match the existing posts): first-person, "constraint as
+design", link to standards/APIs inline, one punchy closing line. Reference other
+posts with root-relative links like `/blog/open-standards`.
+
+Established **tag vocabulary** — reuse these rather than inventing one-offs:
+`android`, `architecture`, `calendula`, `caldav`, `open-standards`,
+`open-source`, `accessibility`, `localization`, `meta`.
+
+## 2. The three states
+
+The gate lives in `src/utils/posts.ts` (`getPublishedPosts()`), which every
+listing, the tag pages, the post routes, and `rss.xml` use.
+
+| `draft` | `pubDate` | Dev server | Production |
+| --- | --- | --- | --- |
+| `true` | any | visible (preview) | **hidden** |
+| `false` | future | visible (preview) | **hidden until the date** |
+| `false` | today / past | visible | **live** |
+
+So:
+
+- **`draft: true`** — work in progress or not yet approved. Never public.
+- **`draft: false` + future `pubDate`** — approved and *scheduled*. Publishes
+  itself on that day (see §3).
+- **`draft: false` + past `pubDate`** — live now.
+
+Preview anything (including drafts and scheduled posts) locally with
+`npm run dev` — the dev server lifts the gate entirely.
+
+## 3. How release actually happens
+
+The site is static, so "now" is frozen at each build. Two things trigger a
+rebuild:
+
+1. **Push to `main`** → Coolify redeploys (the normal deploy).
+2. **The daily cron** → `.gitea/workflows/scheduled-deploy.yml` runs at
+   **06:15 Europe/Berlin**, pings the Coolify deploy hook, and the rebuild
+   re-evaluates the date gate. This is what makes a future-dated post appear on
+   its day without anyone touching the repo.
+
+The cron runs on the shared **`docker`** runner and needs two repo secrets set
+once (Gitea → Settings → Actions → Secrets): `COOLIFY_DEPLOY_HOOK` (the app's
+deploy URL) and `COOLIFY_TOKEN` (a Coolify API token, Bearer).
+
+## 4. Publish checklist
+
+To schedule a post for its date (the normal path):
+
+1. Set `draft: false`, leave the intended future `pubDate`.
+2. Commit and get it onto `main` (branch → PR → merge; PRs via `tea pr create`
+   / `tea pr merge`). Merging deploys, but the post stays hidden until its date.
+3. Done — the daily cron publishes it on `pubDate`.
+
+To release a post **immediately**:
+
+1. Set `draft: false` **and** `pubDate` to today (or a past date), so the gate
+   passes now.
+2. Merge to `main`.
+3. Trigger a rebuild right away instead of waiting for the cron:
+
+   ```sh
+   tea actions workflows dispatch scheduled-deploy.yml --ref main
+   ```
+
+   (`tea` may print `unexpected end of JSON input` — that's it mis-reading
+   Gitea's empty success response; the run still starts. Check it with
+   `tea actions runs list`.)
+4. Coolify rebuilds; confirm at `https://jeanlucmakiola.de/blog/<slug>/`.
+
+## 5. Handy commands
+
+```sh
+npm run dev                                   # preview everything locally
+npm run build                                 # production build (applies the gate)
+tea actions workflows list                    # see the deploy workflow
+tea actions workflows dispatch scheduled-deploy.yml --ref main   # manual deploy
+tea actions runs list                         # watch run status/conclusion
+```
+
+## 6. Gotchas
+
+- **Don't** put non-post `.md` files under `src/content/blog/` — the collection
+  glob will try to parse them as posts and fail the build. Docs like this one
+  live in `docs/`.
+- `pubDate` with no time resolves to `00:00 UTC` that day, so a post becomes
+  eligible at UTC midnight; the morning cron then publishes it. Adjust the cron
+  time in the workflow if you want a different local hour.
+- Timezone for the cron is pinned in the workflow (`TZ=Europe/Berlin`); the
+  gate comparison itself uses the build machine's clock (UTC in CI).