fix error on local-env-setup.sh (#33461)

* fix error on local-env-setup.sh

* Update local-env-setup.sh

Author: marblejenka

.gitignore

@@ -16,6 +16,8 @@ sdks/**/vendor/**/*
 runners/**/vendor/**/*
 **/.gradletasknamecache
 **/generated/*
+/go.mod
+/go.sum
 
 # Ignore sources generated into the main tree
 **/src/main/generated/**

local-env-setup.sh

@@ -24,7 +24,7 @@ darwin_install_pip3_packages() {
 
 install_go_packages(){
         echo "Installing goavro"
-        go get github.com/linkedin/goavro/v2
+        go mod init beam-runtime && go get github.com/linkedin/goavro/v2
         # As we are using bash, we are assuming .bashrc exists.
         grep -qxF "export GOPATH=${PWD}/sdks/go/examples/.gogradle/project_gopath" ~/.bashrc
         gopathExists=$?