Adding upmerge workflow

Signed-off-by: willdavsmith <[email protected]>

.github/workflows/upmerge.yaml

@@ -37,7 +37,7 @@ jobs:
       #     git push --set-upstream origin $BRANCH_NAME
       - name: Upmerge docs
         run: |
-          export SOURCE_BRANCH=${{ inputs.version } }}
+          export SOURCE_BRANCH=${{ inputs.version }}
           echo "Upmerging docs from $SOURCE_BRANCH to edge"
           git fetch origin $SOURCE_BRANCH
           git merge --no-commit origin/$SOURCE_BRANCH