ci: use v3 of cerebrus that also posts a build size report to PRs (#9048)

.github/workflows/pr-check-build-size.yml

@@ -0,0 +1,18 @@
+name: Calculate PR build size
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  calculate-build-size:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Build and check size
+      uses: saqimtiaz/cerebrus@v3
+      with:
+        pr_number: ${{ github.event.pull_request.number }}
+        repo: ${{ github.repository }}
+        base_ref: ${{ github.base_ref }}
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        mode: size:calc

.github/workflows/pr-comment-build-size.yml

@@ -0,0 +1,23 @@
+name: Comment on PR build size (Trusted workflow)
+
+on:
+  repository_dispatch:
+    types: [pr_build_size_report]
+
+jobs:
+  comment-build-size-on-pr:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+
+    steps:
+    - name: Build and check size
+      uses: TiddlyWiki/cerebrus@v3
+      with:
+        pr_number: ${{ github.event.client_payload.pr_number }}
+        repo: ${{ github.repository }}
+        base_ref: ${{ github.event.client_payload.base_branch }}
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        mode: size:comment
+        pr_size: ${{ github.event.client_payload.pr_size }}
+        base_size: ${{ github.event.client_payload.base_size }}

.github/workflows/pr-path-validation.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Validate PR
-      uses: TiddlyWiki/cerebrus@v2
+      uses: TiddlyWiki/cerebrus@v3
       with:
         pr_number: ${{ github.event.pull_request.number }}
         repo: ${{ github.repository }}