Replace exit 1 with return

Swap is to avoid annoyingly closing a user's shell if there is an issue.
The error message will still be the last line and user gets their shell
back.

build/hpc_install.sh

@@ -26,13 +26,13 @@ elif [[ $1 == "rockfish" ]]; then
     module load git/2.42.0
 else
     echo "The cluster name '$1' is not recognized, must be one of: 'longleaf', 'rockfish'."
-    exit 1
+    return
 fi
 
 # Make sure the credentials is is where we expect and have the right perms
 if [ ! -f "$USERDIR/slack_credentials.sh" ]; then
     echo "You need to place sensitive credentials in '$USERDIR/slack_credentials.sh'."
-    exit 1
+    return
 fi
 chmod 600 $USERDIR/slack_credentials.sh
 source $USERDIR/slack_credentials.sh
@@ -49,7 +49,7 @@ if [ ! -d "$FLEPI_PATH" ]; then
     git clone git@github.com:HopkinsIDD/flepiMoP.git $FLEPI_PATH
 elif [ ! -d "$FLEPI_PATH/.git" ]; then
     echo "The flepiMoP found at '$FLEPI_PATH' is not a git clone, unsure of how to proceed."
-    exit 1
+    return
 fi
 
 # Setup the conda environment
@@ -82,11 +82,11 @@ WHICH_PYTHON_OKAY=$( echo "$WHICH_PYTHON" | grep "flepimop-env" | wc -l )
 WHICH_R_OKAY=$( echo "$WHICH_R" | grep "flepimop-env" | wc -l )
 if [[ "$WHICH_PYTHON_OKAY" -ne 1 ]]; then
     echo "The python found is '$WHICH_PYTHON', which does not contain the expected 'flepimop-env'."
-    exit 1
+    return
 fi
 if [[ "$WHICH_R_OKAY" -ne 1 ]]; then
     echo "The R found is '$WHICH_R', which does not contain the expected 'flepimop-env'."
-    exit 1
+    return
 fi
 PYTHON_ARROW_VERSION=$( python -c "import pyarrow; print(pyarrow.__version__)" )
 R_ARROW_VERSION=$( Rscript -e "cat(as.character(packageVersion('arrow')))" )