CI: Never pull image.

Signed-off-by: Grzegorz Kowal <grzegorz@amuncode.org>

.drone.yml

@@ -16,6 +16,7 @@ trigger:
 
 steps:
   - name: build with make
+    pull: never
     image: ubuntu/hpc:latest
     commands:
       - cd ./build
@@ -31,6 +32,7 @@ steps:
       - make MPI=Y NDIMS=3 -j 4
 
   - name: build with cmake
+    pull: never
     image: ubuntu/hpc:latest
     commands:
       - mkdir ./build-cmake/