[Fix] install.sh: when NVM_INSTALL_GITHUB_REPO is set, issue a wa…

…rning

This should only annoy those testing their PRs; real users should never set this env var

install.sh

@@ -58,6 +58,21 @@ nvm_profile_is_bash_or_zsh() {
 nvm_source() {
  local NVM_GITHUB_REPO
  NVM_GITHUB_REPO="${NVM_INSTALL_GITHUB_REPO:-nvm-sh/nvm}"
+ if [ "${NVM_GITHUB_REPO}" != 'nvm-sh/nvm' ]; then
+ { nvm_echo >&2 "$(cat)" ; } << EOF
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@ WARNING: REMOTE REPO IDENTIFICATION HAS CHANGED! @
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
+
+The default repository for this install is \`nvm-sh/nvm\`,
+but the environment variables \`\$NVM_INSTALL_GITHUB_REPO\` is
+currently set to \`${NVM_GITHUB_REPO}\`.
+
+If this is not intentional, interrupt this installation and
+verify your environment variables.
+EOF
+ fi
  local NVM_VERSION
  NVM_VERSION="${NVM_INSTALL_VERSION:-$(nvm_latest_version)}"
  local NVM_METHOD