👷 Gate the publish steps on their tokens

The publish job aborted at the top-of-job NPM_TOKEN assert, so every tag run
since 0.1.1 failed before checkout and nothing was ever published. Lift both
optional secrets into job-level env (the secrets context is not allowed in a
step if) and gate each publish step: the Gitea release on GITEA_TOKEN, npm
publish on NPM_TOKEN. An absent secret now skips only its step, so a tag without
the maintainer's secrets stays green after the packaging checks.

.gitea/workflows/ci.yml

@@ -65,8 +65,8 @@ jobs:
             - uses: actions/checkout@v4
             # Fail fast when the job container is not the baked image: a stale
             # tag on the runner (`forcePull=false` in its pull log) silently
-            # reintroduces the per-job download. Mirrors the publish job's
-            # NPM_TOKEN assert — cheap, and it names the invariant.
+            # reintroduces the per-job download. Cheap, and it names the
+            # invariant.
             - name: Assert the baked tool cache is present
               run: |
                   test -f "/opt/hostedtoolcache/node/$(tr -d '[:space:]' < .node-version)/x64.complete"
@@ -141,20 +141,18 @@ jobs:
         # `.npmrc` rewrite here; only the Node download is skipped.
         container:
             image: gitea.e1nsnull.de/tmu/act-ci:26.8.2
-        # The release page is created with the run's automatic Gitea token
-        # (`github.token`), not `NPM_TOKEN`, so it needs `contents: write`.
-        permissions:
-            contents: write
+        # Lift the optional publish secrets into job-level `env` so the steps
+        # below can gate on them: `secrets` is not an allowed context in a step
+        # `if` (see GitHub's context-availability table), `env` is. An unset
+        # secret arrives as the empty string, which is exactly the skip signal.
+        # A tag pushed without the maintainer's secrets (a fork, a manual
+        # dispatch) now runs the packaging checks and skips only the publish
+        # steps whose token is missing, instead of failing the job at an assert.
+        # Set both in the Gitea repo: Settings → Actions → Secrets.
+        env:
+            NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+            GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
         steps:
-            # Double-gate: publish only runs on a tag *and* aborts here if NPM_TOKEN
-            # is unset, so a tag push never silently no-ops (or half-publishes). Set
-            # NPM_TOKEN in the Gitea repo: Settings → Actions → Secrets.
-            - name: Assert NPM_TOKEN is configured
-              run: |
-                  if [ -z "${{ secrets.NPM_TOKEN }}" ]; then
-                      echo "::error::NPM_TOKEN secret is not set — refusing to publish."
-                      exit 1
-                  fi
             - uses: actions/checkout@v4
             - uses: actions/setup-node@v4
               with:
@@ -173,19 +171,25 @@ jobs:
                   path: dist/
             - run: npm run publish:publint
             - run: npm run publish:attw
-            # The Gitea release page is created *before* `npm publish` on
-            # purpose: a broken page then fails CI without burning an npm
-            # version. The page is cheap to retry, a published version is not.
-            # The body is the matching Keep-a-Changelog section; an unknown tag
-            # makes the extractor exit non-zero, so the page can never go up
-            # empty.
+            # When both tokens are present the Gitea release page is created
+            # *before* `npm publish` on purpose: a broken page then fails CI
+            # without burning an npm version. The page is cheap to retry, a
+            # published version is not. The body is the matching
+            # Keep-a-Changelog section; an unknown tag makes the extractor exit
+            # non-zero, so the page can never go up empty.
             - name: Extract release notes from CHANGELOG.md
+              if: env.GITEA_TOKEN != ''
               env:
                   TAG_REF: ${{ gitea.ref }}
               run: ./scripts/release-notes.sh "${TAG_REF#refs/tags/}" > release-notes.md
-            - uses: https://gitea.com/actions/gitea-release-action@v1
+            - name: Create the Gitea release
+              if: env.GITEA_TOKEN != ''
+              uses: https://gitea.com/actions/gitea-release-action@v1
               with:
+                  token: ${{ env.GITEA_TOKEN }}
                   body_path: release-notes.md
-            - run: npm publish --access public
+            - name: Publish to npm
+              if: env.NPM_TOKEN != ''
+              run: npm publish --access public
               env:
-                  NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+                  NODE_AUTH_TOKEN: ${{ env.NPM_TOKEN }}