Try to make this make more sense

The logic here was pretty confusing. Trying to straighten it out.

task/build-vm-image/0.1/build-vm-image.yaml

@@ -154,21 +154,20 @@ spec:
         echo "$BUILD_DIR"
         ssh -v $SSH_ARGS "$SSH_HOST"  mkdir -p "$BUILD_DIR/workspaces" "$BUILD_DIR/scripts" "$BUILD_DIR/tmp" "$BUILD_DIR/tekton-results" "$BUILD_DIR/entitlement"
 
-        if [! -n "${CONFIG_TOML_FILE}" ]; then
-          echo "No CONFIG_TOML_FILE specified"
-          if [ -f /var/workdir/source/config.toml ]; then
-            echo "Using the config.toml file found in the repository root!"
-            echo "  Remove the config.toml file or set params.CONFIG_TOML_FILE to an invalid path to prevent its use."
-          else
-            echo "No config.toml file found. Set params.CONFIG_TOML_FILE to use one in the repository."
-            export CONFIG_TOML_FILE=config.toml
-          fi
+        if [ ! -n "${CONFIG_TOML_FILE}" ]; then
+          echo "No CONFIG_TOML_FILE specified. Assuming config.toml"
+          export CONFIG_TOML_FILE=config.toml
+        fi
+
+        if [ -f "/var/workdir/source/${CONFIG_TOML_FILE}" ]; then
+          echo "Using the ${CONFIG_TOML_FILE} file found in the repository root!"
+        else
+          echo "No ${CONFIG_TOML_FILE} file found in the repository. Set params.${CONFIG_TOML_FILE}_FILE to a valid config.toml file."
+          exit 1
         fi
-        # ensure that a config toml file is present in case one is not provided or the path is invalid
-        mkdir -p /var/workdir/source/$(dirname $CONFIG_TOML_FILE)
-        echo "Using the following config.toml file:"
-        cat /var/workdir/source/$CONFIG_TOML_FILE
 
+        echo "Using the following ${CONFIG_TOML_FILE} file:"
+        cat /var/workdir/source/$CONFIG_TOML_FILE
 
         rsync -ra "/var/workdir/source/$CONFIG_TOML_FILE" "$SSH_HOST:$BUILD_DIR/config.toml"
         rsync -ra "$HOME/.docker/" "$SSH_HOST:$BUILD_DIR/.docker/"