Limit Swift autobuild runtime to 10 minutes

There's a known issue that causes the Swift autobuilder to hang.  By
setting a timeout, we'll fail earlier and we can rerun the check
earlier.

.github/workflows/__swift-autobuild.yml

@@ -54,6 +54,7 @@ jobs:
       shell: bash
       run: pwd
     - uses: ./../action/autobuild
+      timeout-minutes: 10
     - uses: ./../action/analyze
       id: analysis
     - name: Check database

pr-checks/checks/swift-autobuild.yml

@@ -18,6 +18,7 @@ steps:
     shell: bash
     run: pwd
   - uses: ./../action/autobuild
+    timeout-minutes: 10
   - uses: ./../action/analyze
     id: analysis
   - name: Check database