Mic 4666/schedule build slow tests (#342)

Mic 4666/schedule build slow tests

Fixes format of command to trig if block to run schedule tests
- *Category*: CI
- *JIRA issue*: [MIC-4666](https://jira.ihme.washington.edu/browse/MIC-4666)

-updates format of command to trigger slow tests on schedule build

Testing
Tested new format with push event trigger.

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
           isort . --check --verbose --only-modified --diff
       - name: Test
         run: |
-          if github.event_name == 'schedule'; then
+          if "${{ github.event_name == 'schedule' }}"; then
             pytest --runslow ./tests
           else
             pytest --limit=1 ./tests