fix: dynamic UID in first-boot-containers.sh, remove temp fix-ssh workflow

Replace hardcoded /run/user/1000 with $(id -u archipelago) so first-boot
works regardless of the archipelago user's UID.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/fix-ssh.yml

@@ -1,23 +0,0 @@
-name: Fix SSH Permissions
-
-on:
-  push:
-    branches: [main]
-
-env:
-  HOME: /tmp
-
-jobs:
-  fix-ssh:
-    runs-on: ubuntu-latest
-    timeout-minutes: 2
-    steps:
-      - name: Fix debian user UID and SSH
-        working-directory: /tmp
-        run: |
-          echo "Fixing SSH..."
-          sudo chown -R 1000:1000 /home/debian
-          sudo chmod 700 /home/debian/.ssh
-          sudo chmod 600 /home/debian/.ssh/authorized_keys
-          sudo systemctl restart sshd
-          echo "SSH fixed"