Fill in client-specific values from eec-courses-template

Swaps __CLIENT__/__DOMAIN__ placeholders for twosquirrelspress/
eec-twosquirrelspress/twosquirrelspress.com.

.gitea/workflows/sync.yml

@@ -13,8 +13,8 @@ jobs:
         run: |
           tar czf /tmp/courses.tar.gz courses
           status=$(curl -s -o /tmp/sync-response.json -w '%{http_code}' \
-            -X POST "http://eec-__CLIENT__:8080/admin/sync" \
-            -H "Authorization: Bearer ${__CLIENT___EEC_SYNC_TOKEN}" \
+            -X POST "http://eec-twosquirrelspress:8080/admin/sync" \
+            -H "Authorization: Bearer ${TWOSQUIRRELSPRESS_EEC_SYNC_TOKEN}" \
             --data-binary @/tmp/courses.tar.gz)
           cat /tmp/sync-response.json
           echo
@@ -23,4 +23,4 @@ jobs:
             exit 1
           fi
         env:
-          __CLIENT___EEC_SYNC_TOKEN: ${{ secrets.__CLIENT___EEC_SYNC_TOKEN }}
+          TWOSQUIRRELSPRESS_EEC_SYNC_TOKEN: ${{ secrets.TWOSQUIRRELSPRESS_EEC_SYNC_TOKEN }}