Unset GMT_DATA_SERVER and use the default value (#1558)

Author: seisman

.github/workflows/cache_data.yaml

@@ -51,8 +51,6 @@ jobs:
       - name: Download remote data
         run: |
           python -c "from pygmt.helpers.testing import download_test_data; download_test_data()"
-        env:
-          GMT_DATA_SERVER: https://oceania.generic-mapping-tools.org/
 
       # Upload the downloaded files as artifacts to GitHub
       - name: Upload artifacts to GitHub

package.json

@@ -3,6 +3,6 @@
     "build:miniconda": "curl -o ~/miniconda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh && bash ~/miniconda.sh -b -p $HOME/miniconda",
     "build:pygmt": "conda install mamba -c conda-forge -y && mamba env create -f environment.yml && source activate pygmt && pip install --no-deps .",
     "build:docs": "source activate pygmt && cd doc && make all && mv _build/html ../public",
-    "build": "export PATH=$HOME/miniconda/bin:$PATH && export GMT_DATA_SERVER=https://oceania.generic-mapping-tools.org && npm run build:miniconda && npm run build:pygmt && npm run build:docs"
+    "build": "export PATH=$HOME/miniconda/bin:$PATH && npm run build:miniconda && npm run build:pygmt && npm run build:docs"
   }
 }