retry on skywater-pdk conda-env fetch fail

This is because sometimes while setting up the conda env (skywater's make timing) it fails to fetch something. Then, it exits without retrying. So, here we're retrying, and if something is wrong it will exit after retrying 5 times.

.travisCI/travisBuild.sh

diff --git a/.travisCI/travisBuild.sh b/.travisCI/travisBuild.sh
index 530fba3..ef2fdbf 100644
--- a/.travisCI/travisBuild.sh
+++ b/.travisCI/travisBuild.sh
@@ -22,9 +22,25 @@
 sh ./build-docker.sh > /dev/null
 make skywater-pdk > /dev/null
 if [ $STD_CELL_LIBRARY == all ]; then
-    make all-skywater-libraries;
+    cnt=0
+    until make all-skywater-libraries; do
+    cnt=$((cnt+1))
+    if [ $cnt -eq 5 ]; then
+        exit 2
+    fi
+    rm -rf $PDK_ROOT/skywater-pdk
+    make skywater-pdk > /dev/null
+    done
 else
-    make skywater-library;
+    cnt=0
+    until make skywater-library; do
+    cnt=$((cnt+1))
+    if [ $cnt -eq 5 ]; then
+        exit 2
+    fi
+    rm -rf $PDK_ROOT/skywater-pdk
+    make skywater-pdk > /dev/null
+    done
 fi
 cd ..
 docker run -it -v $(pwd):/some_root -v $(pwd)/.travisCI:/build_root -v $OPEN_PDKS_ROOT:$OPEN_PDKS_ROOT -v $PDK_ROOT:$PDK_ROOT -e OPEN_PDKS_ROOT=$OPEN_PDKS_ROOT -e PDK_ROOT=$PDK_ROOT -u $(id -u $USER):$(id -g $USER) magic:latest  bash -c "cd /build_root && make build-pdk"