Stop shell interpolation on the runner with calling ssh

We want the $PWD variable to be the one on the remote server,
not the value on the runner. So use singe quotes to stop shell interpolation
and to pass the ssh line as is to the rmeote.

.github/workflows/emailformgateway.yaml

@@ -69,7 +69,7 @@ jobs:
 
       - name: Run emailer.test test
         run: |
-          ssh gophercoders.com "source ./test_envs.sh; TEST_TEMPLATES_DIR=$PWD TEST_DOMAIN=gophercoders.com ./emailer.test"
+          ssh gophercoders.com 'source ./test_envs.sh; TEST_TEMPLATES_DIR=$PWD TEST_DOMAIN=gophercoders.com ./emailer.test'
 
       - name: Delete ssh dir
         if: ${{ always() }}