Update install-EasyBuild-develop.sh to allow installation without forking

Some users might just want to use the develop branch without creating all the forks in their account.

Document that you can use "easybuilders" as the github name and do not add a 2nd remote in that case.

Author: Flamefire

easybuild/scripts/install-EasyBuild-develop.sh

@@ -13,6 +13,7 @@ print_usage()
     echo "Usage: $0 <github_username> <install_dir>"
     echo
     echo "    github_username:     username on GitHub for which the EasyBuild repositories should be cloned"
+    echo "                         Use 'easybuilders' if you don't want to use a fork"
     echo
     echo "    install_dir:         directory where all the EasyBuild files will be installed"
     echo
@@ -28,11 +29,13 @@ github_clone_branch()
     echo "=== Cloning ${GITHUB_USERNAME}/${REPO} ..."
     git clone --branch "${BRANCH}" "[email protected]:${GITHUB_USERNAME}/${REPO}.git"
 
-    echo "=== Adding and fetching EasyBuilders GitHub repository @ easybuilders/${REPO} ..."
-    cd "${REPO}"
-    git remote add "github_easybuilders" "[email protected]:easybuilders/${REPO}.git"
-    git fetch github_easybuilders
-    git branch --set-upstream-to "github_easybuilders/${BRANCH}" "${BRANCH}"
+    if [[ $GITHUB_USERNAME != "easybuilders" ]]; then
+        echo "=== Adding and fetching EasyBuilders GitHub repository @ easybuilders/${REPO} ..."
+        cd "${REPO}"
+        git remote add "github_easybuilders" "[email protected]:easybuilders/${REPO}.git"
+        git fetch github_easybuilders
+        git branch --set-upstream-to "github_easybuilders/${BRANCH}" "${BRANCH}"
+    fi
 }
 
 # Print the content of the module