Merge pull request #4 from martin-g/shallow-git-clone

Make git-clone faster by fetching only the last commit of SU2 and the submodules

Author: pcarruscag

build/compileSU2.sh

@@ -44,7 +44,12 @@ if [ ! -z "$branch" ]; then
     mkdir "src"
   fi
   cd "src"
-  git clone --recursive https://github.com/su2code/SU2 $name
+  if [ -d $name ]; then
+    # Remove any previous local repo. For non-ephemeral self-hosted runners
+    rm -rf $name
+  fi
+  # Clone only the latest commit, without the Git history. It is much faster this way. 
+  git clone --recursive --depth=1 --shallow-submodules https://github.com/su2code/SU2 $name
   cd $name
   git config --add remote.origin.fetch '+refs/pull/*/merge:refs/remotes/origin/refs/pull/*/merge'
   git config --add remote.origin.fetch '+refs/heads/*:refs/remotes/origin/refs/heads/*'