allow running main workflows manually

.github/workflows/full-test-suite.yml

@@ -6,6 +6,7 @@ on:
     # When changing these triggers, please ensure the documentation under
     # "Running tests in CI" is still correct.
     - test-*
+  workflow_dispatch:
 
 jobs:
   test_and_package_stage:

.github/workflows/nightly.yml

@@ -3,6 +3,7 @@ name: Nightly build
 on:
   schedule:
   - cron: 30 4 * * *
+  workflow_dispatch:
 
 jobs:
   test_and_package_stage:

.github/workflows/pr-test-suite.yml

@@ -9,6 +9,7 @@ on:
     branches:
     - main
     - "*.x"
+  workflow_dispatch:
 concurrency:
   # https://stackoverflow.com/questions/74117321/if-condition-in-concurrency-in-gha
   group: ${{ github.workflow }}-${{ github.head_ref && github.ref || github.run_id }}