update plugin syntax (#401)

Co-authored-by: mvallillo <mvallillo@microsoft.com>

.gitignore

@@ -24,4 +24,4 @@ installfilesdev
 .uptodate
 
 # allocator compiled plugin
-kubectl-gameserver-allocate
+kubectl-gameserver

cmd/allocator/build-plugin.sh

@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
-CURR_PATH="$(dirname "$BASH_SOURCE")"
+CURR_PATH="$(cd "$(dirname "$BASH_SOURCE")"; pwd)"
 go build -o $CURR_PATH $CURR_PATH/main.go
-mv $CURR_PATH/command-line-arguments $CURR_PATH/kubectl-gameserver-allocate
-export PATH=$PATH:"$(cd $CURR_PATH; pwd)"
+mv $CURR_PATH/command-line-arguments $CURR_PATH/kubectl-gameserver
+BASH_RC="$(cat ~/.bashrc)"
+if ! [[ $BASH_RC =~ "$CURR_PATH" ]]; then
+  echo "export PATH=\"\$PATH:"$CURR_PATH"\"" >> ~/.bashrc
+fi
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