Use ISAR_VERSION variable for publish.sh to be in line with download_binaries.sh

Author: Martin Clauss

tool/publish.sh

@@ -6,11 +6,11 @@
 #
 
 set -o errexit
-if [ "$TAG" == "" ]; then
-  echo "Define TAG to use"
+if [ "$ISAR_VERSION" == "" ]; then
+  echo "Define ISAR_VERSION to specify which release to publish.sh"
   exit 1
 fi
-find . -type f -exec sed -i "s/0.0.0-placeholder/$TAG/g" {} +
+find . -type f -exec sed -i "s/0.0.0-placeholder/$ISAR_VERSION/g" {} +
 pushd packages/isar
 dart pub get
 popd