build: try creating the go bin directory (#19862)

* Try creating the output directory to ensure it always exists

* Use GOBIN path over GOPATH/bin if it is set

changelog/19862.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+build: Prefer GOBIN when set over GOPATH/bin when building the binary
+```

scripts/build.sh

@@ -50,11 +50,13 @@ ${GO_CMD} build \
 
 # Move all the compiled things to the $GOPATH/bin
 OLDIFS=$IFS
-IFS=: MAIN_GOPATH=($GOPATH)
+IFS=: FIRST=($GOPATH) BIN_PATH=${GOBIN:-${FIRST}/bin}
 IFS=$OLDIFS
 
-rm -f ${MAIN_GOPATH}/bin/vault
-cp bin/vault ${MAIN_GOPATH}/bin/
+# Ensure the go bin folder exists
+mkdir -p ${BIN_PATH}
+rm -f ${BIN_PATH}/vault
+cp bin/vault ${BIN_PATH}
 
 # Done!
 echo