fix(ci): retry compiler crashes

.gitea/workflows/ci-deploy.yml

@@ -63,7 +63,15 @@ jobs:
         run: python3 scripts/test-ollama-evaluation.py
 
       - name: Build backend
-        run: dotnet build JobTrackerApi/JobTrackerApi.csproj --configuration Release
+        # Roslyn has intermittently exited 139 on this resource-constrained runner after a
+        # successful restore. Retry once without compiler-server or parallel build processes;
+        # the same complete project is still compiled and warnings/errors remain fatal.
+        run: |
+          dotnet build JobTrackerApi/JobTrackerApi.csproj --configuration Release \
+            || ( echo "Backend compiler crashed ($?) — retrying single-process..." \
+                 && dotnet build JobTrackerApi/JobTrackerApi.csproj --configuration Release \
+                      --no-restore --disable-build-servers --maxcpucount:1 \
+                      /p:UseSharedCompilation=false /p:BuildInParallel=false )
 
       # The "Build backend" step above only builds JobTrackerApi, so the test project needs its own
       # restore + build. These are separate steps on purpose: this runner is flaky (see the SDK and
@@ -76,7 +84,12 @@ jobs:
           restore || ( echo "NuGet restore failed ($?) — retrying once..." && restore )
 
       - name: Build backend tests
-        run: dotnet build JobTrackerApi.Tests/JobTrackerApi.Tests.csproj --configuration Release --no-restore
+        run: |
+          dotnet build JobTrackerApi.Tests/JobTrackerApi.Tests.csproj --configuration Release --no-restore \
+            || ( echo "Test compiler crashed ($?) — retrying single-process..." \
+                 && dotnet build JobTrackerApi.Tests/JobTrackerApi.Tests.csproj --configuration Release \
+                      --no-restore --disable-build-servers --maxcpucount:1 \
+                      /p:UseSharedCompilation=false /p:BuildInParallel=false )
 
       # Restore and build both pass on this runner, but the test run dies after ~3s -- far too fast to
       # have executed 306 tests. The suite passes on Windows, in a clean Linux container, under a 1GB