CI/CD: Use the customized image in .drone.xml.

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

.drone.yml

@@ -16,10 +16,8 @@ trigger:
 
 steps:
   - name: build with make
-    image: debian
+    image: ubuntu-hpc
     commands:
-      - apt -q update
-      - apt -q -y install gawk make gfortran libhdf5-dev libopenmpi-dev
       - cd ./build
       - cp -al make.default make.config
       - cp -al ./hosts/default ./hosts/$HOSTNAME
@@ -33,10 +31,8 @@ steps:
       - make MPI=Y NDIMS=3 -j 4
 
   - name: build with cmake
-    image: debian
+    image: ubuntu-hpc
     commands:
-      - apt -q update
-      - apt -q -y install cmake gfortran libhdf5-dev libopenmpi-dev libzstd-dev liblz4-dev liblzma-dev pkg-config
       - mkdir ./build-cmake/
       - cd ./build-cmake/
       - cmake -LA ..