fix: make CI workflows run after pushing excemptions for cargo-vet

This commits changes the CI for dependabot PRs such that initially, only the exemptions for cargo vet are regenerated and pushed to the PR.
Only after that, all other workflows are triggered. This ensures that the CI result for dependabot PRs is properly presented on github.

.github/workflows/regressions.yml

@@ -3,6 +3,10 @@ on:
   pull_request:
   push:
     branches: [main]
+  workflow_run:
+    workflows: [Regenerate cargo-vet exemptions for dependabot-PRs]
+    types:
+      - completed
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -14,6 +18,8 @@ permissions:
 
 jobs:
   multi-peer:
+    # Only run this for dependabot PRs if it's triggered by the workflow to regenerate cargo-vet exemptions
+    if: ${{ github.actor != 'dependabot[bot]' || github.event_name == 'workflow_run' }}
     runs-on: ubicloud-standard-2-ubuntu-2204
     steps:
       - uses: actions/checkout@v4
@@ -25,6 +31,8 @@ jobs:
           [ $(ls -1 output/ate/out | wc -l) -eq 100 ]
 
   boot-race:
+    # Only run this for dependabot PRs if it's triggered by the workflow to regenerate cargo-vet exemptions
+    if: ${{ github.actor != 'dependabot[bot]' || github.event_name == 'workflow_run' }}
     runs-on: ubicloud-standard-2-ubuntu-2204
     steps:
       - uses: actions/checkout@v4