[ci] Add timeout-minutes to Build and E2E jobs

Without explicit timeouts, stuck jobs use the GitHub Actions
default of 360 minutes (6 hours). This blocks the concurrency
group and prevents new runs from starting.

Set reasonable limits:
- Build: 30 minutes (normally ~5 min)
- E2E: 120 minutes (normally ~60 min)

Assisted-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

.github/workflows/pull-requests.yaml

@@ -29,6 +29,7 @@ jobs:
   build:
     name: Build
     runs-on: [self-hosted]
+    timeout-minutes: 30
     permissions:
       contents: read
       packages: write
@@ -150,6 +151,7 @@ jobs:
     name: "E2E Tests"
     runs-on: ${{ contains(github.event.pull_request.labels.*.name, 'debug') && 'self-hosted' || 'oracle-vm-24cpu-96gb-x86-64' }}
     #runs-on: [oracle-vm-32cpu-128gb-x86-64]
+    timeout-minutes: 120
     permissions:
       contents: read
       packages: read