fix: exporting SWC_DIR env variable to fix beta-docs (#5877)

* fix: exproting SWC_DIR env variable

* chore: try running beta-docs on pr

* chore: run beta-docs only on main

---------

Co-authored-by: Rajdeep Chandra <rajdeepc@adobe.com>
Co-authored-by: TarunAdobe <ttomar@adobe.com>

Author: 3 people

.circleci/config.yml

@@ -297,7 +297,9 @@ jobs:
                   command: cp 1st-gen/projects/documentation/custom-elements.json 1st-gen/storybook/
             - run:
                   name: Build documentation with path prefix
-                  command: echo "SWC_DIR=beta/docs" >> $BASH_ENV
+                  command: |
+                      echo "export SWC_DIR=beta/docs" >> $BASH_ENV
+                      source $BASH_ENV
             - run:
                   name: Build documentation
                   command: yarn workspace @spectrum-web-components/1st-gen docs:build