Add (un-tested) draft for ERAIN_SFC12_MM

ERAIN_SFC12_MM/meta.yaml

+repo_name: ERAIN_SFC12
+
+people:  Willi Rath (<wrath@geomar.de>)
+
+http_path_remote: https://git.geomar.de/data/ERAIN_SFC12
+
+git_path_remote: git@git.geomar.de:data/ERAIN_SFC12
+
+repo_description: |
+    ERA-Interim surface 12_MM
+    <https://cera-www.dkrz.de/WDCC/ui/cerasearch/entry?acronym=ERAIN_SFC12_MM>
+
+citations:
+    - text: "ECMWF (2011). ERA-Interim surface 12_MM. World Data Center for
+        Climate (WDCC) at DKRZ.
+        http://cera-www.dkrz.de/WDCC/ui/Compact.jsp?acronym=ERAIN_SFC12_MM"
+      doi: "---"
+
+prefixes: data doc
+
+credential_files:
+    - "${HOME}/.data_repo_creds/ERAIN_SFC12_MM.cred"
+
+data:
+
+    - cera_data_set: ERAIN_SFC12_MM_EWSS_180
+      prefix: data
+      username_var: CERA_USER
+      password_var: CERA_PWD
+      method: !!python/name:data_repo_renderer.JblobCred
+
+    - cera_data_set: ERAIN_SFC12_MM_NSSS_181
+      prefix: data
+      username_var: CERA_USER
+      password_var: CERA_PWD
+      method: !!python/name:data_repo_renderer.JblobCred
+
+doc:
+
+    - url: "https://cera-www.dkrz.de/WDCC/ui/cerasearch/entry?acronym=ERAIN_SFC12_MM"
+      file_name: cera_ERAIN_SFC12_MM.html
+      prefix: doc
+      method: !!python/name:data_repo_renderer.CurlSingleFile
+
+post_processing:
+
+    - convert_to_netcdf.sh

ERAIN_SFC12_MM/util/convert_to_netcdf.sh

+#!/bin/bash
+
+function convert_grb_to_netcdf {
+    grb_file=$1
+    nc_file="$(echo ${grb_file} | rev | cut -d. -f2- | rev)".nc
+    cdo -t ecmwf -f nc -copy -remapcon,r720x360 -setgridtype,regular \
+        ${grb_file} ${nc_file}
+}
+export -f convert_grb_to_netcdf
+
+find data -iname \*.grb -print0 | \
+    xargs -0 -n1 -P2 -I {} bash -c "convert_grb_to_netcdf {}"