ci: Replace per-run flaky issues with a weekly report

.github/ISSUE_TEMPLATE/flaky.yml

@@ -12,6 +12,7 @@ body:
         - Timeout
         - Assertion failure
         - Other / Unknown
+      default: 1
     validations:
       required: true
   - type: input

.github/workflows/build.yml

@@ -1261,28 +1261,8 @@ jobs:
     # Always run this, even if a dependent job failed
     if: always()
     runs-on: ubuntu-24.04
-    permissions:
-      issues: write
-      checks: read
+    permissions: {}
     steps:
-      - name: Check out current commit
-        if: github.ref == 'refs/heads/develop' && contains(needs.*.result, 'failure')
-        uses: actions/checkout@v7
-        with:
-          sparse-checkout: |
-            .github
-            scripts
-
-      - name: Create issues for failed jobs
-        if: github.ref == 'refs/heads/develop' && contains(needs.*.result, 'failure')
-        uses: actions/github-script@v9
-        with:
-          script: |
-            const { default: run } = await import(
-              `${process.env.GITHUB_WORKSPACE}/scripts/report-ci-failures.mjs`
-            );
-            await run({ github, context, core });
-
       - name: Check for failures
         if: cancelled() || contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
         run: |

.github/workflows/weekly-flaky-tests.yml

@@ -0,0 +1,35 @@
+name: 'CI: Weekly flaky tests'
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 7 * * 1'
+      timezone: 'Europe/Vienna'
+
+permissions:
+  contents: read
+  actions: read
+  checks: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  report:
+    name: Weekly flaky test report
+    runs-on: ubuntu-24.04
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+      - name: Analyze the last seven days of develop CI
+        uses: actions/github-script@v9
+        with:
+          retries: 3
+          script: |
+            const { default: run } = await import(
+              `${process.env.GITHUB_WORKSPACE}/scripts/weekly-flaky-tests.mjs`
+            );
+            await run({ github, context, core });