Make integration tests manual-only

Integration tests currently fail due to Vagrant SSH connection
terminating prematurely during provisioning. Disable automatic
runs until this is resolved.

Changes:
- Remove scheduled weekly runs
- Remove PR label trigger
- Remove conditional if statement
- Add note explaining manual-only status
- Tests can still be run manually via Actions tab

Author: tomjn

.github/workflows/integration.yml

@@ -1,28 +1,16 @@
 name: Integration Tests
 
 on:
-  # Manual trigger
+  # Manual trigger only
+  # Note: These tests currently fail due to Vagrant SSH issues during provisioning
+  # Run manually via Actions tab when needed
   workflow_dispatch:
 
-  # Weekly schedule - Sunday at 00:00 UTC
-  schedule:
-    - cron: "0 0 * * 0"
-
-  # PR trigger when labeled
-  pull_request:
-    types: [labeled]
-
 jobs:
   integration-test:
     name: Integration Tests (Docker)
     runs-on: ubuntu-latest
 
-    # Only run if manually triggered, scheduled, or PR has the label
-    if: |
-      github.event_name == 'workflow_dispatch' ||
-      github.event_name == 'schedule' ||
-      contains(github.event.pull_request.labels.*.name, 'run-integration-tests')
-
     timeout-minutes: 45
 
     steps: