ci: retry corrupt NuGet restores

.gitea/workflows/ci-deploy.yml

@@ -60,12 +60,21 @@ jobs:
         # without contacting Ollama, pulling a model, or requiring package installation.
         run: python3 scripts/test-ollama-evaluation.py
 
-      - name: Build backend
+      - name: Restore backend
-        # Roslyn has intermittently exited 139 on this resource-constrained runner after a
+        # The runner/proxy has occasionally supplied checksum-invalid NuGet cache entries (NU3008).
-        # successful restore. Retry once without compiler-server or parallel build processes;
+        # Retry from clean HTTP/global caches; signature verification remains enabled.
-        # the same complete project is still compiled and warnings/errors remain fatal.
         run: |
-          dotnet build JobTrackerApi/JobTrackerApi.csproj --configuration Release \
+          restore() { dotnet restore JobTrackerApi/JobTrackerApi.csproj; }
+          restore || ( echo "Backend restore failed ($?) — clearing runner NuGet caches and retrying once..." \
+            && dotnet nuget locals http-cache --clear \
+            && dotnet nuget locals global-packages --clear \
+            && dotnet restore JobTrackerApi/JobTrackerApi.csproj --no-cache )
+
+      - name: Build backend
+        # Roslyn has intermittently exited 139 on this resource-constrained runner. Retry once
+        # without compiler-server or parallel build processes; restore failures are handled above.
+        run: |
+          dotnet build JobTrackerApi/JobTrackerApi.csproj --configuration Release --no-restore \
             || ( echo "Backend compiler crashed ($?) — retrying single-process..." \
                  && dotnet build JobTrackerApi/JobTrackerApi.csproj --configuration Release \
                       --no-restore --disable-build-servers --maxcpucount:1 \
@@ -79,7 +88,10 @@ jobs:
       - name: Restore backend tests
         run: |
           restore() { dotnet restore JobTrackerApi.Tests/JobTrackerApi.Tests.csproj; }
-          restore || ( echo "NuGet restore failed ($?) — retrying once..." && restore )
+          restore || ( echo "NuGet restore failed ($?) — clearing runner caches and retrying once..." \
+            && dotnet nuget locals http-cache --clear \
+            && dotnet nuget locals global-packages --clear \
+            && dotnet restore JobTrackerApi.Tests/JobTrackerApi.Tests.csproj --no-cache )
 
       - name: Build backend tests
         run: |