ci(forgejo): fix artifact fork URL, DinD docker access, db test timeout

- forgejo/upload-artifact -> full code.forgejo.org URL (not on github.com,
  where DEFAULT_ACTIONS_URL sent it).
- e2e + journal-image-smoke: set DOCKER_HOST=tcp://docker-in-docker:2375 so
  the job's docker CLI reaches the DinD daemon (no /var/run/docker.sock).
  (Runner config also now attaches jobs to the runner network.)
- @trails-cool/db test: --testTimeout=20000; the cold drizzle/postgres import
  exceeds vitest's 5s default under runner CPU contention.

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

.forgejo/workflows/ci.yml

@@ -184,7 +184,7 @@ jobs:
 
       - name: Upload screenshots on failure
         if: failure()
-        uses: forgejo/upload-artifact@v4
+        uses: https://code.forgejo.org/forgejo/upload-artifact@v4
         with:
           name: visual-snapshots-diff
           path: apps/planner/.vitest-attachments/
@@ -197,6 +197,9 @@ jobs:
     runs-on: ubuntu-latest
     env:
       DATABASE_URL: postgres://trails:trails@localhost:5432/trails
+      # The DinD daemon lives at this address on the runner network; the job
+      # container needs it explicitly (it has no /var/run/docker.sock).
+      DOCKER_HOST: tcp://docker-in-docker:2375
     steps:
       - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
@@ -337,6 +340,7 @@ jobs:
           --health-retries 20
     env:
       DATABASE_URL: postgres://trails:trails@localhost:5432/trails
+      DOCKER_HOST: tcp://docker-in-docker:2375
     steps:
       - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6